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Russian roulette a deadly game of chance in which each participant takes a turn at spinning the cylinder of a revolver that holds only one bullet, pointing it at his or her own head, and pulling the trigger. [2 definitions]
Russian wolfhound the borzoi.
rust the orange-red coating that forms on metal surfaces because of oxidation of the iron in their contents, by exposure to air and water. [6 definitions]
rustic of, occurring, or living in a rural area. [4 definitions]
rusticate to settle in the country and lead a rural life. [3 definitions]
rustle to make soft crackling sounds, as of dry surfaces rubbing gently against each other. [5 definitions]
rustler a person who rustles or steals livestock.
rustproof resistant or impervious to rust. [2 definitions]
rusty covered with or affected by rust; corroded; working or moving stiffly. [3 definitions]
rut1 a furrow or groove worn into the ground by something such as a wheeled vehicle. [3 definitions]
rut2 the periodic condition of sexual arousal in certain male animals, such as deer, during which they seek to mate. [2 definitions]
rutabaga a plant related to cabbage and turnips, with an edible, yellowish, bulbous root. [2 definitions]
ruthenium a chemical element that has forty-four protons in each nucleus and that occurs in pure form as a hard, white, dense metal solid used as a hardener in alloys or as a catalyst. (symbol: Ru)
Rutherford atom the atom regarded as visually analogous to the solar system, with electrons revolving around a nucleus.
ruthless without mercy or compassion; pitiless or cruel.
rutty full of or covered with ruts.
RV abbreviation of "recreational vehicle," a vehicle that is equipped with living quarters and is used for leisure travel.
Rwanda a central African country between Zaire and Tanzania.
Rx abbreviation of "recipe" (Latin); prescription, a directive written by a doctor for the preparation and use of a medicine to treat a designated patient.
-ry variant of -ery.
rye1 a widely cultivated grass, of which the seeds are used for cereal, flour, and other grain products. [4 definitions]