river noun definition in Rivers and lakes topic from the Oxford Advanced Learner's Dictionary

river

 noun: Rivers and lakes topic
(abbreviation R.) a natural flow of water that continues in a long line across land to the sea/ocean the River Thames the Hudson River on the banks of the river (= the ground at the side of a river) to travel up/down river (= in the opposite direction to/in the same direction as the way in which the river is flowing) the mouth of the river (= where it enters the sea/ocean) Can we swim in the river? a boat on the river They have a house on the river (= beside it).