Biology Dictionary: S
Search or browse the dictionary for the definition of biology terms starting with the letter “S”.
Dictionary > S
S
- S factor
- S layer
- S1 nuclease mapping
- Sac
- Saccharide
- Saccharomyces cerevisiae
- Sacrum
- Safety
- Saffron
- Sagittal axis
- Sagittal plane
- Sagittal section
- Salamanders
- Saline solution
- Salinity
- Saliva
- Salivary gland
- Salmonella typhimurium
- Salt fever
- Salt loading
- Saltatory evolution
- Salts
- Saluretic
- Samara
- Sample
- Sample size
- Sand
- Sanguivorous
- Saprophagous
- Saprophyte
- Saprophytic
- Sapwood
- Sarcina
- Sarcine
- Sarcodina
- Sarcolemma
- Sarcomastigophora
- Sarcomere
- Sarcoplasmic reticulum
- Sarcopterygian
- Sardonic grin
- Satellite
- Satellite DNA
- Saturated fatty acid
- Saturated soil
- Saturation
- Saturation of receptors
- Sauba ant
- Saxicolous
- Scale
- Scalene hiatus
- Scales
- Scallop
- Scalp
- Scaly bud
- Scapular reflex
- Scapus pili
- Scar
- Scattering
- Scavenger
- Scent glands
- Schiffs reagent
- Schistosoma
- Schizogony
- Science
- Scientific method
- Scientific name
- Sclereid
- Sclerenchyma
- Scleroprotein
- Sclerotome
- Scorpion
- Scratch reflex
- Scratch test
- Screening test
- Scrotitis
- Sea cat
- Sea fan
- Sea rat
- Sea Zonation
- Seal
- Seaweed
- Sebaceous gland
- Sebum
- Sec
- Seclusion of pupil
- Second filial generation
- Second messenger
- Second set rejection
- Second-order kinetics
- Secondary Carnivore
- Secondary cell wall
- Secondary consumer
- Secondary meristem
- Secondary oocyte
- Secondary phloem
- Secondary spongiosa
- Secondary structure
- Secondary succession
- Secondary Thickening
- Secondary xylem
- Secretion
- Secretion vector
- Section
- Sections
- Secular equilibrium
- Sedge
- Sedges
- Seed
- Seedling
- Segment
- Segmentation
- Segmentation cavity
- Segregation
- Seizure
- Selectable marker
- Selection
- Selective permeability
- Selectively-permeable membrane
- Self
- Self antigen
- Self incompatibility
- Self pollination
- Sellar joint
- Semen
- Semilunar valve
- Seminiferous tubule
- Semipermeable membrane
- Senescence
- Senile
- Sensation
- Sense of touch
- Sense organ
- Sense strand
- Sensery
- Sensibility
- Sensible perspiration
- Sensitive
- Sensitive species
- Sensitivity
- Sensitivity and specificity
- Sensory
- Sensory cell
- Sensory neuron
- Sensu lato
- Sensu stricto
- Sentinel
- Sepal
- Septa
- Septate junction
- Septate mycelium
- Septate uterus
- Septomarginal fasciculus
- Septomarginal tract
- Sequelae
- Sequence
- Sequence homology
- Sequester
- Seral stages
- Serine
- Seriograph
- Serous
- Serous atrophy
- Serous cavity filariasis
- Serous cell
- Serous exudate
- Serratia marcescens
- Sertoli cell
- Serum
- Servomechanism
- Sessile hydatid
- Sessile plant
- Seta
- Sewage
- Sex
- Sex chromosome
- Sex determination
- Sex factor
- Sex hormone
- Sex linkage
- Sex pili
- Sex reversal
- Sex steroid
- Sex-determining Region Y gene
- Sex-linked
- Sex-linked disorder
- Sex-linked trait
- Sexual
- Sexual dimorphism
- Sexual intercourse
- Sexual reproduction
- Sexual selection
- Sexually transmitted disease
- Sh domains
- Shaft
- Shank
- Shawl muscle
- Shear stress
- Sheath
- Sheep
- Shelfords Law of Tolerance
- Shell
- Shellac
- Shelter
- Shifted maxwellian
- Shifting cultivation
- Shine-dalgarno sequence
- Shittah tree
- Shivering
- Shoulder-girdle syndrome
- Shrimp
- Shrub
- Shuttle vector
- Sibship
- Sickle cell anaemia
- Side chain
- Sieve cell
- Sieve element
- Sieve plate
- Sieve tube
- Sieve-tube element
- Sigmoid colon
- Sigmoid sulcus
- Signal
- Signal peptide
- Signal recognition particle
- Signal sequence
- Signature sequence
- Signet ring
- Silent allele
- Silent mutation
- Silurian
- Simian
- Simple columnar epithelium
- Simple cuboidal epithelium
- Simple diffusion
- Simple epithelium
- Simple fruit
- Simple protein
- Simple squamous epithelium
- Simpsons paradox
- Simultaneous hermaphrodite
- Simultaneous perception
- Sinew
- Single bond
- Single cycle circulation
- Single stranded DNA virus
- Single transverse palmar crease
- Single-stranded DNA
- Sink
- Sinus
- Sinus venosus
- Siphon
- Siphonophore
- Siphosome
- Sister chromatids
- Skeletal muscle
- Skeletal system
- Skeleton
- Skin
- Skull
- Slender
- Slime
- Slime layer
- Slime mold
- sloth bear
- Small-scale mutation
- Smooth endoplasmic reticulum
- Smooth muscle
- Smooth muscle relaxant
- Smudge cells
- Smuts
- Snail
- Snake
- Soap
- Soapsuds enema
- Social adaptation
- Sodium bicarbonate
- Sodium hydrogen carbonate
- Sodium-24
- Sodium-potassium pump
- Soft coral
- Soft science
- Soft tubercle
- Softwood
- Soil
- Soil horizon
- Soil microbiology
- Soil percolation
- Soldiers patches
- Sole
- Soliped
- Solitary
- Solubility
- Solubility test
- Soluble antigen
- Solute
- Solution
- Solvent
- Solvent drag
- Somaclonal variation
- Somatagnosia
- Somatalgia
- Somatic cells
- Somatic nervous system
- Somatosensation
- Somatosensory system
- Somatotroph
- Somogyi method
- Sonoporation
- Soosoo
- Sorbitol
- Sorbose
- Sore
- Sorosis
- Sort
- Sos repair
- Space of donders
- Spalding sign
- Sparrow
- Spasm
- Spatial
- Special sense
- Specialisation
- Specialization
- Specialized mucosa
- Speciation
- Speciation event
- Species
- Species area curve
- Species Richness
- Specific
- Specific absorption coefficient
- Specific epithet
- Specificity
- Specimen
- Spectrin
- Speract
- Sperm cell
- Spermatid
- Spermatocytogenesis
- Spermatogenesis
- Spermatophyta
- Spermatophyte
- Spermatozoon
- Spermaturia
- Spermiation
- Spermiogenesis
- Sphagnum
- Sphenethmoid
- Sphenodon guntheri
- Sphenopalatine ganglioneuralgia
- Spheroprotein
- Sphingolipid
- Sphingolipidosis
- Spice
- Spicules
- Spider
- Spider cancer
- Spikelets
- Spin
- Spina iliaca posterior superior
- Spinach
- Spinal nerve
- Spindle
- Spindle apparatus
- Spindle fiber
- Spindle-shaped
- Spine cell
- Spinnbarkeit
- Spiral Thickening
- Spirit lamp
- Spirochetes
- Splanchnic
- Splase
- Splenunculus
- Spliceosome
- Splicing
- Spline
- Split
- Split gene
- Splitting enzymes
- Spondylalgia
- Sponge
- Spongioplasm
- Spongy bone
- Spontaneous
- Spontaneous generation
- Spontaneous Mutation
- Spontaneous transformation
- Sporadic
- Sporangiospore
- Sporangium
- Spore
- Sporogenesis
- Sporogony
- Sporophyte
- Sporophyte generation
- Sporopollenin
- Sporozoa
- Sporozoan
- Sporozoid
- Sporozoite
- Sporozooid
- Sporulation
- Spot
- Spot desmosome
- Spot-film radiography
- Sprain
- Sprouting
- Spurt
- Squamous epithelium
- Squat
- Squid
- SsRNA-RT virus
- Stab culture
- Stability
- Stable
- Stable factor
- Stag
- Stage
- Staircase phenomenon
- Staminate
- Standard deviation
- Standard solution
- Standardization
- Standing Biomass
- Standing crop
- Standing plasma test
- Stannius ligature
- Staphylococcus aureus
- Staphylococcus epidermidis
- Starch
- Starch equivalent
- Starlings law
- Stas-otto method
- Stasis
- State
- Stationary
- Stationary phase
- Statoacoustic nerve
- Statolith
- Stearic acid
- Stem
- Stem and loop structure
- Stem cell
- Stentor
- Stereospecificity
- Sterile
- Sterile cyst
- Sterility
- Sternal angle
- Sternum
- Steroid
- Steroid hormone
- Steroidogenesis
- Sterol
- Stewart-Holmes test
- Stick
- Sticky end
- Stifle
- Stigma
- Stimulation
- Stimulator
- Stimulatory protein 1
- Stimulus
- Stimulus substitution
- Sting
- Stipe
- Stipitate
- Stipulate
- Stipules
- Stirrup
- Stirrups
- Stochastic
- Stock
- Stock culture
- Stoichiometric condition
- Stoma
- Stomach
- Stomata
- Stomodaeum
- Stool
- Storage
- Storage granule
- Strabismus sursum vergens
- Straight seminiferous tubule
- Strain
- Strand
- Strangler
- Strap muscles
- Strata
- Stratification
- Stratified ciliated columnar epithelium
- Stratified columnar epithelium
- Stratified cuboidal epithelium
- Stratified epithelium
- Stratified squamous epithelium
- Stratum
- Stratum corneum
- Stratum germinativum
- Stratum granulosum
- Stratum lucidum
- Stratum spinosum
- Strawberries
- Streaming movement
- Strepsirrhine
- Streptococcus
- Streptolysin O
- Streptolysin S
- Stretch
- Stretch reflex
- Striated muscle
- Striations
- Strigillose
- Stringency
- Stripes
- Strobilus
- Stroke volume
- Stroma
- Structural gene
- Structure
- Stump
- Sty
- Style
- Subcellular
- Subclass
- Subclinical infection
- Subcostal line
- Subcostalgia
- Subcutaneous filariasis
- Subdigastric node
- Subdivisions
- Suberin
- Subfamily
- Subgroup
- Subgroups
- Subkingdoms
- Subliminal stimulus
- Submetacentric chromosome
- Subspecies
- Substance
- Substernal angle
- Substitution
- Substitution mutation
- Substitutive therapy
- Substrate
- Substrate specificity
- Substrate-level phosphorylation
- Substratum
- Subtelocentric chromosome
- Subunit
- Succession
- Succinate
- Suck
- Sucker
- Suckers
- Sucking pad
- Sucrase
- Sucrose
- Sudoresis
- Sudorific
- Sugar
- Sugar acids
- Sugar-phosphate backbone
- Sulcus
- Sulfatide
- Sulfuric ether
- Sulzberger-garbe syndrome
- Summation of stimuli
- Sunlight
- Superclass
- Superfamily
- Superficial cleavage
- Superinvolution
- Superior
- Superior pharyngeal constrictor
- Superior temporal line
- Supermotility
- Supernatant
- Supination
- Supplemental air
- Supplements
- Supporting cell
- Suppression
- Suppressor-sensitive mutant
- Suppuration
- Suppurative
- Suppurative inflammation
- Supraliminal stimulus
- Supravital stain
- Sural region
- Surface tension
- Surface water
- Survival of the fittest
- Susceptibility
- Susceptible
- Suspend
- Suspended animation
- Suspension
- Sustainability
- Suture
- Swab
- Swallow
- Swarm
- Sweat
- Sweat Gland
- Symbiont
- Symbiosis
- Symbol
- Symmetry
- Sympathetic nervous system
- Sympatric speciation
- Sympexis
- Symplast
- Symport
- Symptomatic
- Synapomorphy
- Synapse
- Synapsid
- Synaptonemal complex
- Synarthrodial joint
- Synchrony
- Syncytium
- Syndrome
- Synecology
- Synergism
- Synergist
- Synergistic effect
- Synergy
- Syngamy
- Synkaryon
- Synomone
- Synophrys
- Synovial fluid
- Synovial joint
- Synovial membrane
- Synsepalous
- Syntenic genes
- Synthase
- Synthesis
- Synthesis phase
- Syntrophy
- System
- Systema Naturae
- Systematics
- Systemic anatomy
- Systemic venule
- Systole