Collins American English Dictionary: American Words Starting With “R”
- r ... racerunner
- racetrack ... radiate
- radiation ... radiometer
- radiomimetic ... rage
- ragg ... rainspout
- rainsquall ... Ramazan
- ramble ... rancor
- rand ... rapid transit
- rapid-fire ... raster
- rat ... rattle around in
- rattlebox ... Raymond
- Raynaud's phenomenon ... reactant
- reaction ... realign
- realism ... rebeldom
- rebellion ... reception room
- receptionist ... recombinant
- recombinant DNA ... rectangle
- rectangular ... red dye
- red feed ... red-hot
- red-letter ... redivivus
- Redlands ... reechy
- reed ... refinement
- refinery ... refrigerator car
- refringent ... region
- regional ... reichsmark
- Reichstag ... relativism
- relativity ... reluctant
- reluctivity ... remonstrance
- remonstrant ... renin
- renitent ... repentance
- repentant ... representational
- representationalism ... reputed
- req ... reservoir
- reset ... resolving power
- resonance ... rest on one's oars
- restate ... retain
- retained object ... retire
- retired ... retsina
- return ... reverse mortgage
- reverse osmosis ... revue
- revulsion ... rhenium
- rheo- ... rhizocarpous
- rhizocephalan ... rhumb
- rhumb line ... ribonucleotide
- ribose ... ride at anchor
- ride cymbal ... Rigel
- rigger ... Riley
- rilievo ... ringleader
- ringlet ... ripstop
- riptide ... riverweed
- rivet ... roaring
- roaring forties ... rock bass
- rock bottom ... rockshaft
- rockweed ... role-playing
- Rolfing ... Roman alphabet
- Roman arch ... Röntgen
- rood ... ropery
- ropewalk ... roseslug
- Rosetta stone ... rotche
- rote ... roughneck
- roughrider ... roust
- roustabout ... RPh
- rpm ... rubbing
- rubbing alcohol ... rudery
- rudiment ... Rumelia
- rumen ... run the blockade
- run the gantlet ... runway
- Runyon ... rustical
- rusticate ... Ryukyu
