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rive to tear apart; rend. [3 definitions]
riven a past participle of rive. [2 definitions]
river a large natural stream of water flowing in a definite course or channel toward a lake, ocean, or other body of water. [2 definitions]
riverbank the sloped ground at the edge of a river.
river basin the area of land from which a river and its tributaries drain water.
riverbed the channel of a river in which water flows or used to flow.
riverboat a boat that is suited for use in the relatively shallow waters of a river.
riverfront the section of a settlement, such as a town or city, fronting on a river, esp. one with warehouses, markets, and other commercial enterprises.
riverhead the source of a river.
river horse a hippopotamus.
riverside the ground along a river; bank. [2 definitions]
rivet a metal pin that has a head at one end and is hammered flat at the other end after the shank has been passed through holes in the metal plates or other objects to be pinned together. [3 definitions]
rivulet a tiny stream or brook; trickle.
Riyadh the capital of Saudi Arabia.
riyal the chief monetary unit of Saudi Arabia, equaling twenty qurush and one hundred halalah. [3 definitions]
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]