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rotor the part of a machine that turns or rotates. [2 definitions]
rotten in the state of being rotted; bad; spoiled. [2 definitions]
rotunda a round building, hall, or room, especially one with a dome.
rouble a spelling of ruble used in Canada and Britain. See ruble for more information.
rouge red or pink cosmetics used to color the cheeks or lips.
rough having an uneven surface; not smooth. [6 definitions]
rough it to live without the ordinary daily comforts.
roughly in a rough manner. [2 definitions]
round shaped like a ball or circle. [14 definitions]
roundabout not direct.
roundhouse a round building with a turntable inside where trains are repaired and stored.
round number a number given in terms of the nearest whole number, or given in the nearest tens, hundreds, or the like. The number 50 is a round number for 47.
round out to make complete or perfect.
round trip a trip to a given place and then back to the starting point.
roundup the act of driving cattle together for branding or shipping to market. [3 definitions]
round up to bring together; collect.
rouse to waken from sleep or a state similar to sleep. [3 definitions]
rout1 a confused retreat of troops after they have been beaten. [4 definitions]
rout2 to root about with the snout. [3 definitions]
route a road or course of travel from one place to another. [3 definitions]
routine a regular course of action. [3 definitions]