Biology Dictionary: R
Search or browse the dictionary for the definition of biology terms starting with the letter “R”.
Dictionary > R
R
- R factor
- R loop
- R plasmid
- Ra
- Rac
- Race
- Racemose
- Rachis
- Rachischisis
- Rachischisis partialis
- Racial stocks
- Rack
- Rad
- Radial
- Radial immunodiffusion
- Radial symmetry
- Radiant
- Radiata
- Radiate
- Radiates
- Radiation
- Radiation biophysics
- Radiator
- Radical
- Radicle
- Radiculoneuropathy
- Radii
- Radioactive
- Radioactive atom
- Radioactive decay
- Radioactivity
- Radiodensity
- Radius
- Radix ventralis
- Radula
- Raffinose
- Raft
- Rag
- Ragged
- Ragpickers disease
- Ragsorters disease
- Raillietina
- Railroad nystagmus
- Rain
- Rainbow
- Raineys corpuscles
- Rainfall
- Rainforest
- Raisin
- Raisins
- Rake
- Ram
- Ramenta
- Ramet
- Rami
- Ramification
- Ramp
- Rampe
- Ramsden eyepiece
- Rana
- Ranal
- Random allocation
- Random Mating
- Random sample
- Range
- Ranikhet disease
- Rank
- Raphe
- Rare
- Rare species
- Ras
- Rascaless
- Rasp
- Ratchet
- Rate
- Ratify
- Ratio
- Rational
- Rational drug design
- Rationalization
- Rations
- Raw
- Ray
- Rayleigh criterion
- Razor
- Rb
- Rda
- RDNA
- Reabsorption
- React
- Reactant
- Reactants
- Reaction
- Reaction center
- Reaction centre
- Reaction of degeneration
- Reactive oxygen species
- Reactivity
- Read
- Reading frame
- Reagent
- Reaginic antibody
- Real
- Realized niche
- Reannealing
- Rear
- Reason
- Rebel
- Rebound
- Rebound phenomenon
- Rebuck skin window technique
- Recalcitrant
- Recall
- Recapitulation theory
- Receiver
- Receiver cell
- Recent single-origin hypothesis
- Receptacle
- Receptaculum chyli
- Reception
- Receptive
- Receptor
- Receptor protein
- Receptor site
- Recess
- Recession
- Recessive
- Recessive Character
- Recessive trait
- Recipient
- Reciprocal
- Reciprocation
- Reclamation
- Recognition sequence
- Recoil
- Recoil atom
- Recombinant
- Recombinant DNA
- Recombination
- recombination DNA repair
- Recombination nodule
- Recon
- Reconciliation Behavior
- Reconstitution
- Reconstruction
- Record of decision
- Recourse
- Recover
- Recovery
- Recreation
- Recruit
- Recruitment
- Rectangles
- Rectification
- Rectify
- Rector
- Rectouterine pouch
- Rectovesical septum
- Rectum
- Recumbent
- Recycling
- Red algae
- Red blood cell
- Red drop effect
- Redd
- Redia
- Redox reaction
- Reduce
- Reduced enamel epithelium
- Reduced eye
- Reduced penetrance
- Reducer
- Reducing
- Reducing agent
- Reducing enzyme
- Reducing sugar
- Reductant
- Reductase
- Reduction
- Reduction Division
- Reduction en masse
- Reductive Division
- Redundancy
- Redundancy Hypothesis
- Redundant
- Rees-ecker fluid
- Reference method
- References
- Referral
- Refine
- Reflect
- Reflected light
- Reflected ray
- Reflection
- Reflectors
- Reflex
- Reflex arc
- Reformation
- Refract
- Refractile
- Refraction
- Refractive index
- Refractory
- Refractory Period
- Refrigeration
- Refuse disposal
- Refute
- Regard
- Regelation
- Regeneration
- Regime
- Regimen
- Regio inguinalis
- Regio lumbalis
- Regio mentalis
- Regio zygomatica
- Region
- Regional anatomy
- Regional continuity model
- Regions
- Register
- Regma
- Regression
- Regression of the mean
- Regular
- Regulation
- Regulator
- Regulatory gene
- Regulatory site
- Regurgitation
- Rehabilitation
- Reids base line
- Reign
- Reinforcement
- Reins
- Relationship
- Relative
- Relative fitness
- Relative value scales
- Relative viscosity
- Relax
- Relaxation
- Relaxed dna
- Relaxed plasmid
- Relay
- Relay neuron
- Release
- Release phenomenon
- Releases
- Relevant
- Reliability
- Reliability coefficient
- Relief
- Relief area
- Remainder
- Remedies
- Remission
- Remit
- Remittent fever
- Remnant
- Remnants
- Remodeling
- Remote
- Remove
- Ren
- Renal calyses
- Renal calyx
- Renal column
- Renal cortex
- Renal medulla
- Renal pelvis
- Renal pyramid
- Renal vein
- Renaturation
- Renewable resource
- Rennase
- Rennin
- Renogastric
- Repair
- Repeated sequences
- Repel
- Repellent
- Repent
- Repetition
- Repetitive DNA
- Replacement
- Replacement bone
- Replacement model
- Replenish
- Repletion
- Replica
- Replica plating
- Replicase
- Replicate
- Replication
- Replication fork
- Replication origin
- Replicative form
- Repolarization
- Repolarize
- Represent
- Representative
- Representatives
- Repressible enzyme
- Repression
- Repression-sensitization
- Repressor
- Repressor protein
- Reproduction
- Reproductive adaptation
- Reproductive bud
- Reproductive Cell
- Reproductive isolation
- Reproductive system
- Reptiles
- Reptilia
- Repulsion
- RER
- RES
- Resact
- Rescue
- Research design
- Research personnel
- Research support
- Resection
- Reservation
- Reserve
- Reserves
- Reservoir
- Reservoir host
- Resident
- Resident fish
- Residual
- Residual air
- Residual volume
- Residue
- Residuum
- Resilience
- Resin
- Resistance
- Resistance factor
- Resistors
- Resolution
- Resolution acuity
- Resolvase
- Resolve
- Resolving power
- Resonance
- Resonance energy transfer
- Resorption
- Resorption lacunae
- Resource
- Resources
- Respect
- Respiration
- Respiration rate
- Respiratory chain
- Respiratory metabolism
- Respiratory substrate
- Respiratory system
- Respire
- Respirometer
- Respond
- Respondent conditioning
- Response
- Response hierarchy
- Rest
- Rest bite
- Rest nitrogen
- Rest position
- Resting cells
- Resting potential
- Resting tidal volume
- Restoration
- Restraints
- Restriction
- Restriction endonuclease
- Restriction enzyme
- Restriction fragments
- Restriction point
- Restriction site
- Restrictions
- Restrictive temperature
- Rests of serres
- Result
- Resultant
- Results
- Resurrection
- Resuscitation
- Retard
- Retardation
- Retards
- Rete testis
- Retention
- Retention cyst
- Retention form
- Reticul-
- Reticular activating system
- Reticular connective tissue
- Reticular fiber
- Reticular lamina
- Reticulated
- Reticuloendothelial cell
- Reticuloendothelial system
- Retina
- Retinal
- Retinol
- Retort
- Retract
- Retraction
- Retreat
- Retrieval
- Retrograde
- Retrograde axonal transport
- Retrospective
- Retrotransposon
- Retrovirus
- Rev
- Revelation
- Reverberating circuit
- Reversal
- Reversal learning
- Reverse
- Reverse banding
- Reverse Mutation
- Reverse passive agglutination
- Reverse transcriptase
- Reverse transcription
- Reversible
- Reversion
- Revertant
- Revision
- Revolution
- Rh factor
- Rheotaxis
- Rheotropism
- Rhese projection
- Rhinalgia
- Rhinarium
- Rhizobium leguminosarum
- Rhizoids
- Rhizome
- Rhizophora
- Rhizopoda
- Rhodopsin
- Rib
- Ribbon
- Ribes ganglion
- Ribonuclease
- Ribonucleic acid
- Ribonucleoprotein
- Ribonucleoside
- Ribonucleotide
- Ribose
- Ribosomal DNA
- Ribosomal ribonucleic acid
- Ribosome
- Ribosomes
- Ribozyme
- Rice
- Rice-water stool
- Rich
- Rid
- Rider
- Riders bone
- Riders muscles
- Ridge
- Ridges
- Riffle
- Right fibrous trigone
- Right sagittal fissure
- Rigidity
- Rigor
- Rim
- Ring
- Ring test
- Rings
- Riot
- Riparian buffer
- Ripe
- Ripening
- Ripple
- Risk
- Risk factor
- Risk factors
- Ritual
- Ritualistic behaviour
- River
- Rivet Hypothesis
- Rmp
- Rmv
- RNA polymerase
- Rna splicing
- RNA virus
- RNA-dependent DNA polymerase
- Roach clasp
- Roan
- Roast
- Robison ester
- Robust
- Rochelle salt
- Rochers sign
- Rock
- Rod
- Rods
- Roe
- Rogue
- Role
- Roll sulfur
- Roller
- Rollers nucleus
- Rolling
- Rolling circle mechanism
- Ronnes nasal step
- Roof of mouth
- Room temperature
- Roost
- Root
- Root apex
- Root cap
- Root cutting
- Root filaments
- Root Hair
- Root nodules
- Root pressure
- Root sprout
- Root System
- Root tip
- Rooted
- Ropes test
- Rosacea
- Rosales
- Rose
- Roser-nelaton line
- Roses position
- Rosette
- Rosette formation
- Rostral
- Rostrum
- Rostrum sphenoidale
- Rotary joint
- Rotate
- Rotation
- Rotatoria
- Rotten
- Rough endoplasmic reticulum
- Rough line
- Roughage
- Rouleaux formation
- Round
- Round heart
- Rovsings sign
- Row
- ROY G. BIV
- Rub
- Rubies
- Rubisco
- Rudiment
- Rudimentary
- Rudiments
- Rudp carboxylase
- Rue
- Ruffle
- Rule of nines
- Rumen
- Ruminant
- Rumination
- Rummel tourniquet
- Run
- Rung
- Runner
- Runt disease
- Rupture
- Ruptures
- Rural
- Rush
- Rushes
- Rushton bodies
- Rust
- Rut