n. A stream; a river.n. In physical geography, in the United States, especially in New England, a narrow defile with nearly vertical walls, the bottom of which is usually occupied by a mountain torrent.n. An artificial channel for a stream of water to be applied to some industrial use.In gold-mining, to carry off in a flume, as the water of a stream, in order to lay bare the auriferous sand and gravel forming the bed.n. An inclined trough in which water runs, used in transporting logs or timbers.In lumbering, to transport, as logs or timbers, by a flume.To conduct a channel or canal, by a flume, along an artificial temporary construction in situations where an earth or masonry channel cannot readily be secured by excavation and embankment.To build a flume or artificial channel and its supporting construction.