| rifampin | (noun) an antibacterial drug (trade names Rifadin and Rimactane) used to treat tuberculosis | Synonyms: Rifadin, Rimactane |
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| rife | (adjective) excessively abundant | Synonyms: overabundant, plethoric |
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| (adjective) most frequent or common | Synonyms: dominant, predominant, prevailing, prevalent |
| riff | (noun) a jazz ostinato; usually provides a background for a solo improvisation | - |
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| (verb) play riffs | - |
| (verb) look through a book or other written material | Synonyms: flick, flip, leaf, riffle, thumb |
| riffle | (noun) shuffling by splitting the pack and interweaving the two halves at their corners | - |
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| (noun) a small wave on the surface of a liquid | Synonyms: ripple, rippling, wavelet |
| (verb) shuffle (playing cards) by separating the deck into two parts and riffling with the thumbs so the cards intermix | - |
| (verb) twitch or flutter | Synonyms: flick, ruffle |
| (verb) stir up (water) so as to form ripples | Synonyms: cockle, ripple, ruffle, undulate |
| (verb) look through a book or other written material | Synonyms: flick, flip, leaf, riff, thumb |
| riffraff | (noun) disparaging terms for the common people | Synonyms: rabble, ragtag, ragtag and bobtail |
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| rifle | (noun) a shoulder firearm with a long barrel and a rifled bore | - |
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| (verb) go through in search of something; search through someone's belongings in an unauthorized way | Synonyms: go |
| (verb) steal goods; take as spoils | Synonyms: despoil, foray, loot, pillage, plunder, ransack, reave, strip |
| riflebird | (noun) velvety black Australian bird of paradise with green and purple iridescence on head and tail | Synonyms: Ptloris paradisea |
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| rifled | (adjective) of a firearm; having rifling or internal spiral grooves inside the barrel | - |
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| rifleman | (noun) a soldier whose weapon is a rifle | - |
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| (noun) someone skilled in the use of a rifle | - |
| rifling | (noun) the cutting of spiral grooves on the inside of the barrel of a firearm | Synonyms: grooving |
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| rift | (noun) a personal or social separation (as between opposing factions) | Synonyms: breach, break, falling out, rupture, severance |
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| (noun) a narrow fissure in rock | - |
| (noun) a gap between cloud masses | - |