100+ Science Words that Start With R

Explore science words that start with r.

Science Words that Start With R

Here are 100 science words that start with “R”:

  • Radiation
  • Reaction
  • Reproduction
  • Respiration
  • Ribosome
  • Resistance
  • Redox
  • RNA
  • Refraction
  • Reactant
  • Radioactive
  • Recessive
  • Resonance
  • Retrovirus
  • Replication
  • Receptor
  • Rhythm
  • Rheology
  • Renal
  • Regeneration
  • Radial
  • Radiometer
  • Radiology
  • Ribonucleotide
  • Ribonuclease
  • Rheumatoid
  • Ruminant
  • Retrograde
  • Retrotransposon
  • Reticulum
  • Radon
  • Renin
  • Rosetta
  • Rhizosphere
  • Renormalization
  • Retroviral
  • Reagent
  • Red blood cell
  • Ribosomal RNA (rRNA)
  • Rubisco
  • Renal failure
  • Ribozyme
  • Recombination
  • Reaction rate
  • Radioisotope
  • Ribonucleic acid
  • Radiography
  • Ribose
  • Repressor
  • Redox reaction
  • Radiofrequency
  • Reproductive system
  • Resting potential
  • Renal artery
  • Retroviral vector
  • Rumen
  • RNA interference
  • Radial symmetry
  • Renal tubule
  • Reaction mechanism
  • Rheumatology
  • Rickettsia
  • Radiolabeling
  • Ruminant digestion
  • Repressor protein
  • Replication fork
  • Retina
  • Reactivity
  • Reproductive organ
  • Rh factor
  • Ribosomal subunit
  • Radiopaque
  • Rhabdomyosarcoma
  • Radiopharmaceutical
  • Random sample
  • Resting state
  • Radioimmunoassay
  • Rubella
  • Replicative form
  • Refractive index
  • Ribonucleotide reductase
  • RNA polymerase
  • Renal cortex
  • Regenerative medicine
  • Root
  • Renal pelvis
  • Reticular formation
  • Retrospective study
  • Radiotherapy
  • Radial velocity
  • Rhizome
  • Reverse transcription
  • Recessive allele
  • Respiratory system
  • Renal function
  • Rhodopsin
  • Rumen fermentation
  • Rhythmogenesis
  • Ribozygosity

Related: Science Words A to Z

science words that start with r

Science Words That Start With R (By Grade)

Science Words That Start With R (4th Grade):

  • Rock
  • Rain
  • River
  • Root
  • Rotation
  • Rainbow
  • Reptile
  • Refraction
  • Respiratory
  • Radiate
  • Recharge
  • Ruler
  • React
  • Reflection
  • Rust
  • Rebound
  • Rodent
  • Ruby
  • Rhythm
  • Reptilian

Science Words That Start With R (5th Grade):

  • Rock cycle
  • Rainforest
  • River ecosystem
  • Root system
  • Rotation
  • Rainbow spectrum
  • Reptilian species
  • Refraction of light
  • Respiratory system
  • Radiant energy
  • Renewable resources
  • Ruler measurement
  • Reactivity
  • Reflection of sound
  • Rust corrosion
  • Rebound effect
  • Rodent species
  • Ruby gemstone
  • Rhythm synchronization
  • Resistance (electrical)

Science Words That Start With R (6th Grade):

  • Rock formation
  • Renewable energy
  • Reproductive system
  • Respiration rate
  • Rotation axis
  • Rain gauge
  • Rheology
  • Redox reaction
  • Ribonucleic acid (RNA)
  • Radiometric dating
  • Reflex arc
  • Ribosome
  • Recombinant DNA
  • Relative humidity
  • Respiratory quotient
  • Radioactive decay
  • Rhizosphere
  • Refractive index
  • Rutherford scattering
  • Radiology

Science Words That Start With R (7th Grade):

  • Resilience
  • Radiometric dating methods
  • RNA interference
  • Reproductive isolation
  • Restriction enzyme
  • Ribosomal RNA
  • Reactive oxygen species
  • Rheumatoid arthritis
  • Radioisotope
  • Recombinant protein
  • Randomized controlled trial
  • Ribonucleotide reductase
  • Radial symmetry
  • Renewable fuel
  • RNA splicing
  • Raman spectroscopy
  • Red blood cell
  • Reverse osmosis
  • Retrovirus
  • Radiosensitivity

Science Words That Start With R (8th Grade):

  • Retrotransposon
  • Renal physiology
  • Ribozyme
  • RNA sequencing
  • Reproductive cloning
  • Radiopharmaceutical
  • Receptor tyrosine kinase
  • Ribulose bisphosphate
  • Riemann hypothesis
  • Red giant star
  • Regenerative medicine
  • Reverse transcriptase
  • Radial velocity
  • RNA polymerase
  • Recombinant DNA technology
  • Ribosomal protein
  • Radioactive isotope
  • Resonance structure
  • Rheological behavior
  • Radiative forcing

Science Words Starting With R (By Subject)

Physics Words That Start With R:

  • Radiation
  • Refraction
  • Resistance
  • Relativity
  • Rotation
  • Radioactivity
  • Resonance
  • Redshift
  • Reversible
  • Rutherford
  • Refractive index
  • Rigid body
  • Radiant energy
  • Reactor
  • Rest mass
  • Radial velocity
  • Raman effect
  • Rayleigh scattering
  • Reaction rate
  • Radiative cooling

Chemistry Words That Start With R:

  • Reactant
  • Reduction
  • Reactivity
  • Radical
  • Reactor
  • Redox
  • Resonance
  • Rust
  • Ring
  • Reaction rate
  • Reagent
  • Reaction mechanism
  • Ribosome
  • Regioselectivity
  • Rearrangement
  • Reflux
  • Rosin
  • Rancidity
  • Retro-aldol reaction
  • Riboflavin

Biology Words That Start With R:

  • Ribosome
  • Reproduction
  • Respiration
  • RNA
  • Replication
  • Receptor
  • Resilience
  • Reproductive system
  • Retrovirus
  • Recessive
  • Reflex
  • Renal
  • Rumen
  • Rhizome
  • Retina
  • Reticulum
  • Reptile
  • RNA interference (RNAi)
  • Rhodopsin
  • Root

Math Words That Start With R:

  • Ratio
  • Radical
  • Real numbers
  • Rational number
  • Regression
  • Range
  • Rotation
  • Root
  • Radius
  • Rectangular coordinates
  • Radian
  • Residue
  • Random variable
  • Reflection
  • Riemann sum
  • Rotation matrix
  • Relative frequency
  • Rational function
  • Right angle
  • Rounding

Physical Science Words That Start With R:

  • Radiation
  • Refraction
  • Radioactivity
  • Reactivity
  • Redshift
  • Resistance
  • Rutherford scattering
  • Resonance
  • Refractive index
  • Radiant energy

Science Words Beginning with R with Meaning:

  • Reproduction: Process of producing offspring.
  • Respiration: Cellular process for energy production.
  • RNA: Ribonucleic acid, essential for protein synthesis.
  • Rotation: Circular movement around an axis.
  • Refraction: Bending of light as it passes through different mediums.
  • Rainforest: Dense forest with high rainfall and biodiversity.
  • Renewable: Resource capable of natural regeneration or replenishment.
  • Revolution: Orbital motion of a celestial body around another.
  • Redshift: Phenomenon of light moving away, causing a shift to longer wavelengths.
  • Radiant: Emitting light or energy.
  • Recessive: Genetic trait masked by a dominant allele.
  • Resilience: Ability to recover from challenges or adversity.
  • Rhombus: Quadrilateral with all sides equal in length.
  • Rotation: Circular movement around an axis.
  • Relative: Considered in relation to something else.
  • Rust: Oxidation of iron or steel, forming a reddish-brown coating.
  • Regeneration: Process of renewing or regrowing damaged tissue.
  • Raptor: Bird of prey, like eagles or hawks.
  • Ribosome: Cell organelle involved in protein synthesis.
  • Reflection: Bouncing back of light or sound waves from a surface.

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