- Reverse osmosis
- Reverse pharmacology
- Reverse reaction
- Reverse tolerance
- Reverse transcriptase
- Reverse transcriptase inhibitors
- Reverse transcription polymerase chain reaction
- Reverse triiodothyronine
- Reverse vaccinology
- Reversed phase HPLC
- Reversed phase chromatography
- Reversible cerebral vasoconstriction syndrome
- Reversible process
- Reversine
- Revesz syndrome
- Review of systems
- Reviparin
- Revised Trauma Score
- Reward circuit
- Reward dependence
- Rewards
- Rex1
- Rexin G
- Rexin-G
- Rey-Osterrieth Complex Figure Test
- Reye syndrome
- Rezafungin
- Rhabdoid tumor
- Rhabdomyolysis
- Rhabdomyoma
- Rhabdomyosarcoma
- Rhabdosphincter
- Rhabdoviridae
- Rhagades
- Rhamnogalacturonan-II
- Rhamnose
- Rhamnus
- Rhapontigenin
- Rheb
- Rhein
- Rheobase
- Rheometers
- Rheotaxis
- Rheum ribes
- Rheumatic disease
- Rheumatic fever
- Rheumatism
- Rheumatoid arthritis
- Rheumatoid factor
- Rheumatoid nodules
- Rheumatoid nodulosis
- Rheumatoid pleuritis
- Rheumatoid vasculitis
- Rheumatology
- Rhinitis
- Rhinitis medicamentosa
- Rhinology
- Rhinophyma
- Rhinoplasty
- Rhinorrhea
- Rhinoscopy
- Rhinosinusitis
- Rhinosporidiosis
- Rhinosporidium seeberi
- Rhinotomy
- Rhinovirus
- Rhipicephalus microplus
- Rhizobacteria
- Rhizobia
- Rhizobium
- Rhizomelia
- Rhizomelic chondrodysplasia punctata
- Rhizopus
- Rhizopus arrhizus
- Rhizopus microsporus
- Rhizopus oryzae
- Rhizosphere
- Rhizotomy
- Rho factor
- Rho family of GTPases
- Rho kinase inhibitors
- Rho(d) immune globulin
- Rho-associated protein kinase
- Rhodamine
- Rhodamine 123
- Rhodamine 6G
- Rhodamine b
- Rhodanese
- Rhodiola rosea
- Rhodnius
- Rhodococcus
- Rhodococcus equi
- Rhododendron
- Rhodopsin
- Rhodopsin kinase
- Rhodotorula
- Rhombencephalon
- Rhombic lip
- Rhomboid
- Rhomboid fossa
- Rhomboid major
- Rhomboid major muscle
- Rhomboid minor
- Rhomboid muscle
- Rhomboid protease
- Rhonchi
- Rhoptry
- Rhubarb
- Rhynchophylline
- Rhythmic movement disorder
- Rhytidectomy
- Rib
- Rib cage
- Rib fracture
- Rib spreader
- Ribavirin
- Ribitol
- Ribociclib
- Riboflavin
- Riboflavin deficiency
- Riboflavin kinase
- Ribokinase
- Ribonuclease
- Ribonuclease A
- Ribonuclease III
- Ribonuclease L
- Ribonuclease T1
- Ribonuclease inhibitor
- Ribonucleases
- Ribonucleic acid
- Ribonucleoprotein particles
- Ribonucleoproteins
- Ribonucleotide reductase inhibitor
- Ribonucleotides
- Riboprobe
- Ribose 5 phosphate
- Ribosomal DNA
- Ribosomal RNA
- Ribosomal frameshift
- Ribosomal protein S6
- Ribosomal proteins
- Ribosomal s6 kinase
- Ribosome biogenesis
- Ribosome display
- Ribosome profiling
- Ribosome recycling factor
- Ribosome-binding site
- Ribosome-inactivating protein
- Ribosomes
- Ribosomopathy