- Resection margin
- Reserpine
- Residence time
- Residence time distribution
- Residential care
- Residents
- Residual body
- Residual schizophrenia
- Residual volume
- Residue
- Resin
- Resin acid
- Resiniferatoxin
- Resiquimod
- Resistance
- Resistance mutation
- Resistance training
- Resistant starch
- Resistin
- Resistome
- Reslizumab
- Resocialization
- Resolvin
- Resonance frequency analysis
- Resonant cavity
- Resorcinol
- Resorption
- Resource
- Respect
- Respect for persons
- Respimat
- Respiration
- Respiratory acidosis
- Respiratory alkalosis
- Respiratory arrest
- Respiratory bronchiolitis interstitial lung disease
- Respiratory burst
- Respiratory center
- Respiratory chain
- Respiratory compensation
- Respiratory compromise
- Respiratory depression
- Respiratory disease
- Respiratory distress
- Respiratory distress syndrome
- Respiratory disturbance index
- Respiratory drive
- Respiratory droplets
- Respiratory epithelium
- Respiratory failure
- Respiratory hypersensitivity
- Respiratory inductance plethysmography
- Respiratory infections
- Respiratory insufficiency
- Respiratory mechanics
- Respiratory minute volume
- Respiratory monitoring
- Respiratory mucosa
- Respiratory muscle
- Respiratory muscles
- Respiratory quotient
- Respiratory sinus arrhythmia
- Respiratory system
- Respiratory therapists
- Respiratory tract
- Respiratory tract diseases
- Respiratory tract infections
- Respiratory zone
- Respirometer
- Respirovirus
- Respite care
- Response Evaluation Criteria in Solid Tumors
- Response bias
- Response factor
- Response inhibition
- Response regulators
- Response surface methodology
- Response variable
- Responsive neurostimulation device
- Rest
- Rest pain
- Restenosis
- Resting energy expenditure
- Resting heart rate
- Resting metabolic rate
- Resting potential
- Resting state
- Resting state fMRI
- Resting tremor
- Restless legs syndrome
- Restlessness
- Reston virus
- Restorative justice
- Restricted randomization
- Restricted use pesticides
- Restriction digest
- Restriction endonucleases
- Restriction enzymes
- Restriction fragments
- Restriction maps
- Restriction modification system
- Restriction point
- Restriction sites
- Restrictive cardiomyopathy
- Restrictive lung disease
- Restylane
- Resuscitation
- Resuscitative endovascular balloon occlusion of the aorta
- Resuscitative thoracotomy
- Resuscitator
- Retained antrum syndrome
- Retained placenta
- Retainer
- Retapamulin
- Retardation factor
- Retarders
- Retching
- Rete mirabile
- Rete pegs
- Rete testis
- Retention factor
- Retention time
- Reteplase
- Reticular activating system
- Reticular cells
- Reticular dermis
- Reticular dysgenesis
- Reticular fibers
- Reticular formation
- Reticulate evolution
- Reticulin
- Reticuline
- Reticulocyte
- Reticulocyte count
- Reticulocyte index
- Reticulocyte production index
- Reticulocytopenia
- Reticulocytosis
- Reticuloendothelial system
- Reticulohistiocytoma
- Reticulohistiocytosis
- Reticulospinal tract
- Reticulum
- Retifanlimab
- Retigabine
- Retina
- Retinacula
- Retinal
- Retinal correspondence
- Retinal degeneration