- radioactography
- republic of equatorial guinea
- roller blind
- rollerblading
- republic of iraq
- richard henry tawney
- robert oppenheimer
- revolutionary proletarian army
- reid
- recombinant human insulin
- Riemannian geometry
- radioimmune assay
- radioisotope renogram
- renin angiotensin system
- radioresistant
- retinal purple
- reconbination value
- rectangular shape
- reaction solvent
- reaction propereity
- ray bradbury
- ray douglas bradbury
- rateable
- robert schumann
- red dwarf
- reagan
- robert e. peary
- rhinoceros antiquitatis
- recent epoch
- rhein
- rhine river
- rochester
- republic of kiribati
- rice bodies
- robert benchley
- richard j. roberts
- richard john roberts
- respiratory acidosis
- raskolnikov
- richard jordan gatling
- richard leakey
- robert king merton
- read_only memory chip
- river cooter
- round_the_clock
- richard lovelace
- relative permittivity
- rocky mountain national park
- ratline
- republic of the sudan