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RR1 abbreviation of "railroad," a road of parallel steel rails upon which railway cars travel. [2 definitions]
RR2 abbreviation of "rural route," delivery of mail along rural routes, usu. to a roadside mailbox rather than to the door; RD.
-rrhagia abnormal or extreme discharge or flow.
-rrhea flow or discharge.
R.S.V.P. abbreviation of "répondez s'il vous plaît" (French); please reply.
rte. abbreviation of "route."
Ru symbol of the chemical element ruthenium.
rub to apply friction and pressure to with a back and forth motion; He rubbed his sore arm. [8 definitions]
rubato with some notes arbitrarily lengthened and others correspondingly shortened (used as a musical direction to indicate flexibility and expressiveness). [3 definitions]
rubber1 a highly elastic solid made of dried and coagulated sap or latex from various tropical plants, esp. the rubber tree. [9 definitions]
rubber2 a series of three or five games, as in bridge, played until one side wins a specific score or number of games. [2 definitions]
rubber band a narrow, elastic, circular or oval loop of natural or synthetic rubber, used to hold together separate objects, papers, or the like.
rubber cement an adhesive made of unvulcanized rubber suspended in a volatile solvent.
rubber check a check that is worthless because the account it is drawn on lacks the funds to pay it; check that bounces.
rubberize to coat or treat with rubber or a rubber preparation.
rubberneck (informal) one who stretches his or her neck in order to see better; gawker. [3 definitions]
rubber plant any of several plants that yield a milky sap from which crude rubber can be coagulated. [2 definitions]
rubber stamp a hand-held device with a flat rubber surface into which lettering or a design has been pressed, used by inking the rubber surface and pressing it on a piece of paper or the like to transfer the lettering or design. [2 definitions]
rubber-stamp to print with a rubber stamp. [3 definitions]
rubbery like rubber in consistency or elasticity.
rubbing the act of one that rubs. [2 definitions]