1. A ditch; a channel for water made by digging. Little channels or dikes cut to every bed. Ray. 2. An embankment to prevent inundations; a levee. Dikes that the hands of the farmers had raised . . . Shut out the turbulent tides. Longfellow. 3. A wall of turf or stone. [Scot.] 4. (Geol.) A wall-like mass of mineral matter, usually an intrusion of igneous rocks, filling up ren...