Skip to content

Main Navigation

Biology Online Logo
  • Dictionary
  • Articles
  • Tutorials
  • Biology Forum




Biology Dictionary: M

Search or browse the dictionary for the definition of biology terms starting with the letter “M”.

  • Featured Terms
  • All Terms
  • Popular Terms
  • Aa
  • Bb
  • Cc
  • Dd
  • Ee
  • Ff
  • Gg
  • Hh
  • Ii
  • Jj
  • Kk
  • Ll
  • Mm
  • Nn
  • Oo
  • Pp
  • Qq
  • Rr
  • Ss
  • Tt
  • Uu
  • Vv
  • Ww
  • Xx
  • Yy
  • Zz
Dictionary > M
AllC

M

  • Ma
  • Mab
  • Mac
  • Macaca fascicularis
  • Maceration
  • Mach line
  • Machine
  • Macroevolution
  • Macronucleus
  • Macronutrient
  • Macroorganism
  • Macrophage
  • Macrophallus
  • Macrophthalmia
  • Macrophyte
  • Macroscopic
  • Macrospore
  • Macula adherens
  • Macula cerulea
  • Macula lutea
  • Macular erythema
  • Mad
  • Magenta tongue
  • Magnanimous
  • Magnesia magma
  • Magnetosome
  • Magnetotaxis
  • Magnification
  • Magnitude
  • Magnoliopsida
  • Magnum
  • Magnus
  • Maintain
  • Maintenance
  • Maintenance dose
  • Maize
  • Major groove
  • Major histocompatibility complex
  • Mal
  • Mala
  • Malabar itch
  • Maladies
  • Malady
  • Malaria
  • Malate
  • Maldigestion
  • Male
  • Male chromosome complement
  • Malevolent
  • Malformation
  • Malfunction
  • Malic acid
  • Malicious
  • Malignant
  • Malleable
  • Malnutrition
  • Malpighian layer
  • Malpighian tubule
  • Malt
  • Maltase
  • Maltose
  • Maltotriose
  • Malvaceae
  • Mamma
  • Mammal
  • Mammalia
  • Mammalogy
  • Mammary gland
  • Mammotropic hormone
  • Management area
  • Mandible
  • Mandibular arch
  • Mango
  • Mangrove
  • Manicy
  • Manifest
  • Manifestation
  • Manifestations
  • Manifold
  • Manipulation
  • Manna
  • Manner
  • Manners
  • Mannitol
  • Mannosans
  • Mannose
  • Manometer
  • Mantis
  • Mantle
  • Mantle layer
  • Manual
  • Manubrium
  • Manubrium sterni
  • Map
  • Map distance
  • Mapping
  • Marbling
  • Mare
  • Mareys law
  • Margin
  • Marginal
  • Marine
  • Marker
  • Marker enzyme
  • Marker gene
  • Marker locus
  • Marram Grass
  • Marriage
  • Marrow
  • Marsh
  • Marsipobranch
  • Marsupial
  • Marsupium
  • Martial
  • Masculine uterus
  • Mash
  • Mask
  • Masked
  • Masking
  • Mass
  • Mass extinction
  • Masses
  • Masseteric tuberosity
  • Master eye
  • Masticatory apparatus
  • Masticatory mucosa
  • Masticatory surface
  • Mastich
  • Mastigonemes
  • Mastigophora
  • Mastotomy
  • Match
  • Matched-pair analysis
  • Matching
  • Mate
  • Mater
  • Materia alba
  • Material
  • Material Body
  • Maternal
  • Maternal gene
  • Maternal inheritance
  • Maternal-effect gene
  • Mating
  • Matrix
  • Maturation
  • Maturation index
  • Maturation-promoting factor
  • Mature
  • Mature mRNA
  • Maturity
  • Maxillary antrum
  • Maxillectomy
  • Maxillipeds
  • Maximum
  • Maximum temperature
  • Mayers reflex
  • Mayos vein
  • Maze
  • MDNA
  • Mean
  • Mean vector
  • Measure
  • Measurement
  • Meat
  • Meatus
  • Mechanical
  • Mechanical equilibrium
  • Mechanism
  • Mechanoreceptor
  • Media
  • Medial
  • Medial canthus
  • Medial longitudinal fissure
  • Medial margin
  • Medial surface
  • Median
  • Median plane
  • Mediate
  • Mediator
  • Mediators
  • Medical biophysics
  • Medicinal plant
  • Mediotrusion
  • Meditation
  • Medium
  • Medulla
  • Medulla oblongata
  • Medullary cavity
  • Medullary chemoreceptor trigger zone
  • Medullary cone
  • Medullary Sheath
  • Medullated nerve
  • Medusa
  • Medusoid
  • Meeting
  • Megakaryoblast
  • Megakaryocyte
  • Megaspore
  • Meiocene
  • Meiosis
  • Meiosis I
  • Meiosis II
  • Meiospore
  • Meiotic spindle
  • Meissners corpuscle
  • Melamine
  • Melancholy
  • Melanin
  • Melanism
  • Melanocyte
  • Melanocyte-stimulating hormone
  • Melanoderma
  • Melanogenesis
  • Melanophore
  • Melanosome
  • Melatonin
  • Meliphagan
  • Melon
  • Melotia
  • Melting
  • Melting temperature of dna
  • Meltzer-lyon test
  • Member
  • Membrana fibrosa
  • Membrane
  • Membrane attack complex
  • Membrane potentials
  • Membrane protein
  • Membrane Transport Protein
  • Membrane vesicles
  • Membranous
  • Membrum inferius
  • Membrum superius
  • Memory
  • Memory B cell
  • Memory cell
  • Memory loop
  • Memory T cell
  • Menadione
  • Mendelian inheritance
  • Mendels Law of Heredity
  • Mendels laws
  • Menetriers syndrome
  • Menostasis
  • Menostaxis
  • Menoxenia
  • Menstrual cycle
  • Menstruation
  • Menstruum
  • Mentagra
  • Mental aberration
  • Mental impression
  • Mental protuberance
  • Mental scotoma
  • Mercurial
  • Mercury
  • Mericarp
  • Meridian
  • Meridional
  • Meristem
  • Merkel disk receptor
  • Merkels tactile disk
  • Meroblastic cleavage
  • Merocrine gland
  • Merozoite
  • Mesentery
  • Mesh
  • Meshwork
  • Mesocarnivore
  • Mesoderm
  • Mesokaryotic
  • Mesophyll
  • Mesophyll layer
  • Mesophyte
  • Mesoplankton
  • Mesosome
  • Mesozoic
  • Mesquit
  • Messenger
  • Messenger ribonucleic acid
  • Met
  • Meta-analysis
  • Metabole
  • Metabolic burst
  • Metabolic disorder
  • Metabolic pathway
  • Metabolic Process
  • Metabolic rate
  • Metabolic Water
  • Metabolism
  • Metabolite
  • Metacentric chromosome
  • Metachromasia
  • Metachromatic granules
  • Metakinesis
  • Metal
  • Metalloenzyme
  • Metameric
  • Metamerism
  • Metamorphic
  • Metamorphism
  • Metamorphosis
  • Metamyelocyte
  • Metaphase I
  • Metaphase II
  • Metaphloem
  • Metaphor
  • Metastasis
  • Metatherian mammal
  • Metaxylem
  • Metazoan
  • Meter
  • Meters
  • Methane
  • Methanogen
  • Methanogenesis
  • Methanotroph
  • Methionine
  • Methodical
  • Methodology
  • Methyl
  • Methyl aldehyde
  • Methyl group
  • Metratrophy
  • Metric
  • Metric system
  • Mexican hat cell
  • Mica
  • Michaelis-menten equation
  • Michaelis-menten hypothesis
  • Microaerophile
  • Microalgae
  • Microbe
  • Microbial
  • Microbiology
  • Microbodies
  • Microelectrode
  • Microevolution
  • Microfibril
  • Microfilament
  • Microfilaria
  • Microhabitat
  • Microheterogeneity
  • Microinjection
  • Microliter
  • Micrometer
  • Micromole
  • Micron
  • Micronucleus
  • Micronutrient
  • Microorganism
  • Microparasites
  • Microphagous
  • Microphthalmia
  • Micropyle
  • Microsatellite
  • Microscope
  • Microscopic
  • Microscopic anatomy
  • Microscopic section
  • Microscopy
  • Microsphere
  • Microspheres
  • Microspore
  • Microtome
  • Microtubule
  • Microtubule nucleation
  • Microtubule organizing center
  • Microtubule-associated protein
  • Microvilli
  • Microvillus
  • Microwave
  • Micturition reflex
  • Mid
  • Midaxillary line
  • Middle lamella
  • Midgut
  • Midline
  • Midrib
  • Midsagittal section
  • Midsternum
  • Migrates
  • Migration
  • Mild
  • Mildew
  • Milieu
  • Milieu interieur
  • Milk
  • Milk-ejection reflex
  • Mill
  • Mill residue
  • Mill wheel murmur
  • Millepora alcicornis
  • Milling
  • Millipede
  • Millons reagent
  • Millons test
  • Milt
  • Mim number
  • Mimesis
  • Mimetic muscles
  • Mimetism
  • Mimic
  • Mimic genes
  • Mimicry
  • Mind blindness
  • Mine
  • Mineral
  • Mineral soil
  • Mineral wax
  • Mineralization
  • Mineralocorticoid
  • Miners asthma
  • Miniature end plate potential
  • Minimal
  • Minimum temperature
  • Minisatellite
  • Mint
  • Minuscule
  • Minute
  • Minute mutant
  • Miosis
  • Mirror image
  • Miscible
  • Misogamy
  • Misopedia
  • Missense mutation
  • Mist
  • Mit
  • Mite
  • Mitigate
  • Mitigation
  • Mitochondrial DNA
  • Mitochondrial inheritance
  • Mitochondrion
  • Mitogen
  • Mitoplast
  • Mitoribosome
  • Mitospore
  • Mitotic phase
  • Mitotic spindle
  • Mitral valve
  • Mixed bud
  • Mixing
  • Mixotroph
  • Mixotrophy
  • Mixture
  • Mm
  • MNGIE syndrome
  • Mo
  • Mobile
  • Mobile genetic element
  • Mobile ion carrier
  • Mobility
  • Mobilization
  • Mock
  • Moco
  • Mod
  • Modality
  • Mode
  • Model
  • Moderator variable
  • Modern genetics
  • Modern human being
  • Modest
  • Modification
  • Modification enzyme
  • Modulate
  • Modulation
  • Modulus
  • Mohr pipette
  • Moiety
  • Moist rale
  • Moisten
  • Moisture
  • Moisture content
  • Molar
  • Molar absorption coefficient
  • Molar absorptivity
  • Molar behaviour
  • Molar extinction coefficient
  • Molarity
  • Molasses
  • Mold
  • Mole
  • Molecular behaviour
  • Molecular biology
  • Molecular chaperones
  • Molecular disease
  • Molecular dispersion
  • Molecular distillation
  • Molecular formula
  • Molecular genetics
  • Molecular mass
  • Molecular neuroscience
  • Molecular structure
  • Molecular weight
  • Molecular weight ratio
  • Molecule
  • Mollusca
  • Molluscs
  • Molting
  • Molybdoferredoxin
  • Moment
  • Momentum
  • Monad
  • Monandria
  • Monandrous
  • Monarch
  • Monarchy
  • Monasteries
  • Monastery
  • Monera
  • Mongolian fold
  • Mongrel
  • Moniliform hair
  • Monism
  • Monitor
  • Monk
  • Monkey
  • Mono
  • Monoblast
  • Monoblastic
  • Monochromatic
  • Monoclonal
  • Monoclonal antibody
  • Monocondylic skull
  • Monocot
  • Monocotyledon
  • Monocular
  • Monocular vision
  • Monoculture
  • Monocyte
  • Monocytopenia
  • Monocytopoiesis
  • Monod-Wyman-Changeux model
  • Monoecious
  • Monogene
  • Monogenea
  • Monogenesis
  • Monogenetic
  • Monogenic disease
  • Monogenic inheritance
  • Monogenic trait
  • Monogenism
  • Monoglyceride
  • Monograph
  • Monohybrid
  • Monohybrid cross
  • Monolayer
  • Monomania
  • Monomer
  • Monomeric
  • Monometric
  • Monomorphic
  • Mononuclear leukocyte
  • Mononuclear phagocyte system
  • Mononucleate
  • Mononucleotide
  • Monophyletic
  • Monoploid
  • Monoploidy
  • Monosomy
  • Monospermy
  • Monotremata
  • Monotreme
  • Monotropa
  • Monounsaturated fat
  • Monounsaturated fatty acid
  • Monovalent
  • Monozygotic twins
  • Montgomerys follicles
  • Monticulus
  • Moon
  • Moon face
  • Moores lightning streaks
  • Moral
  • Moraxella bovis
  • Morbidity
  • Mordant
  • Morpheus
  • Morphogenesis
  • Morphological features
  • Morphology
  • Morphometry
  • Mortal
  • Mortality rate
  • Mortar
  • Mortification
  • Mosaic
  • Mosaic disease
  • Mosaic egg
  • Mosaicism
  • Moss
  • Moss capsule
  • Mosses
  • Motes
  • Moth
  • Mother
  • Mother cell
  • Mother colony
  • Mother liquor
  • Motif
  • Motile
  • Motility
  • Motion
  • Motivation
  • Motogen
  • Motor
  • Motor activity
  • Motor neuron
  • Motor point
  • Motor protein
  • Mottling
  • Moulding
  • Moulds
  • Mound
  • Mount
  • Mountain
  • Mounting
  • Mouse unit
  • Mouth
  • Mouth of the womb
  • Movable joint
  • Move
  • Movement
  • Mri
  • MRNA
  • Mu
  • Mucilage
  • Mucilaginous
  • Mucin
  • Mucoid
  • Mucolipidosis
  • Mucopeptide
  • Mucor
  • Mucosa
  • Mucous connective tissue
  • Mucous gland
  • Mucous membrane
  • Mucus
  • Mud
  • Muddy
  • Mudfish
  • Mulch
  • Mule
  • Multicellular
  • Multicellularity
  • Multicuspid tooth
  • Multiparous
  • Multipennate muscle
  • Multiple
  • Multiple alleles
  • Multiple fruit
  • Multiplexing
  • Multiplication
  • Multiplicative growth
  • Multiplies
  • Multiply
  • Multipolar
  • Multipolar mitosis
  • Multipotent
  • Multipotent cell
  • Multiregional model
  • Mung
  • Municipal
  • Murein
  • Murine
  • Musci
  • Muscle
  • Muscle contraction
  • Muscle fascicle
  • Muscle fatigue
  • Muscle plasma
  • Muscle plate
  • Muscle relaxation
  • Muscle spindle
  • Muscle tissue
  • Muscle tone
  • Muscle tonus
  • Muscle-trimming
  • Muscular dystrophy
  • Muscular system
  • Musculi linguae
  • Musculi thoracis
  • Musculus biventer mandibulae
  • Musculus ischiococcygeus
  • Muses
  • Mushroom
  • Mussels
  • Mutagen
  • Mutagenesis
  • Mutagens
  • Mutant
  • Mutation
  • Mutation frequency
  • Muted tidal regime
  • Mutein
  • Mutilation
  • Muton
  • Mutual resistance
  • Mutualism
  • Mutualistic symbiosis
  • Mv
  • Mw
  • Mya
  • Myanmar
  • Mycelium
  • Mycetes
  • Mycology
  • Mycoplankton
  • Mycorrhiza
  • Mycotic stomatitis
  • Myelin
  • Myelin sheath
  • Myelinated nerve
  • Myelinated nerve fiber
  • Myelinated neuron
  • Myeloblast
  • Myeloplegia
  • Myelopoiesis
  • Mylohyoid groove
  • Mylohyoid ridge
  • Myoblast
  • Myocardium
  • Myoepithelial cell
  • Myofibril
  • Myofibrosis
  • Myofibrositis
  • Myofilament
  • Myogenesis
  • Myoglobin
  • Myology
  • Myomalacia
  • Myometrium
  • Myopia
  • Myosalpingitis
  • Myosin
  • Myosin atpase
  • Myosin filament
  • Myotenositis
  • Myriapoda
  • Myricin
  • Mythology
  • Mytilus edulis
  • Myxine
  • Myxoid degeneration
  • Home
  • Dictionary
  • Articles
  • Tutorials
  • Biology Forum
  • About Us
  • Contact Us
  • Partners
  • Editorial Guidelines

The content on this website is for information only. It is not intended to provide medical, legal, or any other professional advice. Any information here should not be considered absolutely correct, complete, and up-to-date. Views expressed here do not necessarily reflect those of Biology Online, its staff, or its partners. Before using our website, please read our Privacy Policy.

© 2001-2021 BiologyOnline. All Rights Reserved