| rifampin | (noun) an antibacterial drug (trade names Rifadin and Rimactane) used to treat tuberculosis | Synonyms: Rifadin, Rimactane |
|---|
| riff | (noun) a jazz ostinato; usually provides a background for a solo improvisation | - |
|---|
| riffle | (noun) shuffling by splitting the pack and interweaving the two halves at their corners | - |
|---|
| (noun) a small wave on the surface of a liquid | Synonyms: ripple, rippling, wavelet |
| riffraff | (noun) disparaging terms for the common people | Synonyms: rabble, ragtag, ragtag and bobtail |
|---|
| rifle | (noun) a shoulder firearm with a long barrel and a rifled bore | - |
|---|
| riflebird | (noun) velvety black Australian bird of paradise with green and purple iridescence on head and tail | Synonyms: Ptloris paradisea |
|---|
| rifleman | (noun) a soldier whose weapon is a rifle | - |
|---|
| (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 |
|---|
| rift | (noun) a personal or social separation (as between opposing factions) | Synonyms: breach, break, falling out, rupture, severance |
|---|
| (noun) a narrow fissure in rock | - |
| (noun) a gap between cloud masses | - |