Biology Dictionary: O
Search or browse the dictionary for the definition of biology terms starting with the letter “O”.
Dictionary > O
O
- O antigen
- Obermayers test
- Object
- Objectives
- Obligate
- Obligate aerobe
- Obligate anaerobe
- Obligate mutualism
- Obligate parasite
- Oblique
- Observation
- Oceanian realm
- Octose
- Oedema
- Oestrous Cycle
- Oestrus
- Offshoot
- Offspring
- Ohngrens line
- Oil
- Oil retention enema
- Oils
- Okazaki fragment
- Old World monkey
- Olecranon
- Olfactory nerve
- Olfactory receptor cells
- Oligohydramnios
- Oligonucleotide
- Oligopeptide
- Oligosaccharide
- Omega-6 fatty acid
- Omission
- Omnivore
- Omnivorous diet
- Oncogene
- Online systems
- Ontogenesis
- Onychatrophia
- Oocyst
- Oocyte
- Oogonium
- Ookinete
- Opaque microscope
- Open circulatory system
- Open system
- Operation
- Operator
- Operator region
- Operculum
- Operon
- Ophthalmomalacia
- Opisthaptor
- Opisthomastigote
- Opportunistic pathogen
- Opsonin
- Opsonization
- Optical density
- Optimum
- Opuntia
- Oral vestibule
- Orbicularis oris
- Orbits
- Orcinol test
- Order
- Organ
- Organ culture
- Organelle
- Organic
- Organic catalyst
- Organic chemistry
- Organic compound
- Organic matter
- Organic molecule
- Organic synthesis
- Organism
- Organization
- Organizational affiliation
- Orientation
- Orifice
- Origin
- Oropharynx
- Orthodox
- Orthology
- Os multangulum minus
- Os uteri internum
- Osmoregulation
- Osmosis
- Osmotic lysis
- Osmotic Potential
- Osmotic pressure
- Osmotrophy
- Ossa digitorum
- Osseous tissue
- Osteichthyes
- Osteoblast
- Osteoclast
- Osteocyte
- Osteomalacia
- Osteon
- Osteopetrosis
- Osteoporosis
- Ostium
- Ostrich
- Otodynia
- Otolith
- Outbreak
- Outbreeding
- Outgroup
- Output
- Outwelling
- Ovarian cycle
- Ovarian fossa
- Overbank flooding
- Overdominance
- Overhang
- Overlapping genes
- Overshoots
- Ovum
- Ox
- Oxic
- Oxidant
- Oxidase
- Oxidation
- Oxidation-fermentation test
- Oxidative metabolism
- Oxidative phosphorylation
- Oxidizer
- Oxidoreductase
- Oxygen
- Oxygen Debt
- Oxygen deficit
- Oxyhemoglobin
- Oxytocin
- Oyster
- Ozochrotia