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RNA any of several single-stranded nucleic acids containing the sugar ribose that occur in the cytoplasm of all living cells and are essential in protein synthesis; ribonucleic acid.
roach1 a cockroach.
roach2 a freshwater fish related to carp, found in northern Europe. [2 definitions]
road a long, narrow course, often with a smooth and paved surface, made for the passage of vehicles and people. [3 definitions]
roadability the degree of comfort and efficiency of a road vehicle.
road agent a highway robber of stagecoaches, as in the nineteenth-century western United States.
roadbed the bed, as of gravel or crushed stone, on which a railway is laid. [2 definitions]
roadblock a barricade placed across the road to stop traffic and allow for inspection by police or to stop movement of the enemy by a military force. [3 definitions]
road hog one who drives so as to obstruct other traffic moving in the same direction, as by occupying parts of both lanes simultaneously.
roadhouse an inn, bar, restaurant, or nightclub on a country or suburban road.
roadkill the remains of an animal killed by being struck by a car or other vehicle. [2 definitions]
roadless combined form of road.
road map a motorist's map that shows the routes, road types, mileage between towns, and the like for a specified region.
road racing automobile racing on a course of or resembling public roads.
roadrunner a ground-dwelling, swift North American cuckoo with a long tail, a crest, and streaked plumage.
roadshow a show performed by a touring theatrical company. [2 definitions]
roadside the side or edge of a road. [2 definitions]
roadstead an area of water close to shore, but less protected than a harbor, in which ships can anchor.
roadster an open automobile of earlier design, with a single seat for two or three passengers and either a large trunk or a rumble seat in the rear.
road test a test made on the road under normal driving conditions to assess the quality of a vehicle's performance, undertaken esp. by a prospective buyer or by a mechanic servicing a vehicle in need of repair. [2 definitions]
roadway the main part of a road, esp. that used by vehicles. [2 definitions]