| rm. |
abbreviation of "room," a subsection of a building separated from similar sections by walls or partitions. |
| RN |
abbreviation of "registered nurse," a nurse who has completed extensive training and passed a state examination licensing him or her to practice nursing. |
| Rn |
symbol of the chemical element radon. |
| 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 |
a 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. |