China
Africa
- Rotational frequency
- Rotational molding
- Rotational spectroscopy
- Rotational speed
- Rotational symmetry
- Rotational temperature
- Rotational viscosity
- Rotator cuff
- Rotator cuff tear
- Rotavirus
- Rotaxanes
- Rotenone
- Rotodynamic pump
- Roton
- Rotor
- Rotor ship
- Rotor wing
- Rotorcraft
- Rotordynamics
- Rotunda
- Rough set
- Roughing pump
- Roughness length
- Rouleaux
- Round
- Round robin tests
- Round window
- Round-off error
- Round-robin
- Round-robin scheduling
- Round-robin test
- Round-trip delay
- Roundabouts
- Rounding
- Roundness
- Roundup
- Route
- Route capacity
- Route of administration
- Router
- Routing
- Routing and wavelength assignment
- Routing loops
- Routing protocol
- Routing table
- Roux-en-y
- Rovers
- Roving
- Row
- Row echelon form
- Row-major order
- Rowing
- Rowing cycle
- Roxarsone
- Rprop
- Rubber
- Rubber cement
- Rubber elasticity
- Rubber pad forming
- Rubber removal
- Rubber seed oil
- Rubber tyred gantry crane
- Rubber washer
- Rubberized asphalt
- Rubble
- Rubble masonry
- Rubella
- Rubella virus
- Rubia cordifolia
- Rubidium
- Rubidium carbonate
- Rubidium standard
- Rubidium-82
- Rubisco
- Rubredoxin
- Rubrene
- Rubrics
- Ruby
- Ruby laser
- Rudder
- Rudder pedals
- Ruddlesden-Popper phase
- Ruderal
- Ruderal species
- Ruggedized
- Ruins
- Rule 184
- Rule induction
- Rule of inference
- Rule of mixtures
- Rule-based machine learning
- Rule-based machine translation
- Rule-based system
- Ruled surface
- Rumble strips
- Rumen
- Ruminococcus
- Run charts
- Run-and-tumble motion
- Run-of-the-river
- Run-of-the-river hydroelectricity
- Run-out
- Run-time infrastructure
- Runaway electrons
- Runge's phenomenon
- Runoff
- Runoff curve number
- Runoff model
- Runtime library
- Runway
- Runway excursion
- Runway incursions
- Runway safety
- Runx1
- Runx2
- Rupture
- Rupture disc
- Rupture of membranes
- Rural health
- Rushton turbine
- Russian iron
- Rust remover
- Rusticles
- Rut
- Ruthenium
- Ruthenium oxide
- Ruthenium trichloride
- Ruthenium(iv) oxide
- Ruthenium-106
- Ruthenocene
- Rutherford backscattering
- Rutherford backscattering spectrometry
- Rutherford scattering
- Rutherfordium
- Rutile
- Rutin
- Ruts
- Ryanodine
- Ryanodine receptor
- Ryanodine receptors
- Rydberg constant
- Rydberg formula
- Rydberg states
- Ryr2
- S transform
- S waves
- S-II
- S-PRISM
- S-Plus
- S-box