waterfall A sudden descent of water over a step or ledge in the bed of a river. ENVO ENVO:00000040 EcoLexicon:force EcoLexicon:waterfall FTT:435 FTT:436 FTT:439 FTT:680 Geonames:H.FLLS TGN:21161 TGN:21166 WATERFALL Wikipedia:Waterfall cascade cataract fall falls force linn waterfalls Should this be a hydroform? lotic water body