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robot a mechanical device, esp. one controlled electronically, that can perform physical tasks of a human being, often used in industrial assembly or the like. [2 definitions]
robot bomb a jet-propelled, winged bomb or missile guided by an automatic steering device and carrying a warhead; buzz bomb; cruise missile.
robotics (used with a sing. verb) the technology of designing and using robots for various, usu. industrial tasks.
rob roy (sometimes caps.) a cocktail composed of Scotch whisky, sweet vermouth, and bitters.
rob the cradle to choose as a companion or mate someone much younger than oneself.
robust physically strong, healthy, and energetic. [6 definitions]
roc in Arabian mythology, a huge and powerful bird.
rocambole a European onion that resembles a lily and bears a cluster of small bulbs used like garlic.
Roche limit the lowest altitude at which a natural satellite can form and orbit a planet or the like without being disturbed by gravitational forces.
Rochelle salt a colorless, saltlike, crystalline compound used in silvering mirrors, in making baking powders, as a laxative, and in electronics.
rochet a knee-length vestment, usu. of lace and linen, worn by bishops and certain other church officials in some ceremonies.
rock1 a large mass of hard mineral matter that lies under the earth's soil or forms a cliff, mountain, or the like. [4 definitions]
rock2 to sway strongly back and forth or from side to side. [9 definitions]
rockabilly rock-'n'-roll music combined with or influenced by country and western styles.
rock and rye a bottled combination of rye whiskey, rock candy, and fruit.
rockaway a light, four-wheeled, horse-drawn carriage with two or three seats and a fixed top.
rock bass an edible, freshwater game fish of eastern North America, related to the sunfish.
rock bottom the very lowest point or level.
rock-bound bounded by rocks, as a coastline.
rock brake any of various related ferns that grow in rocky soil.
rock candy large, clear, hard nuggets of crystallized sugar.