槽碓 cáoduì water-powered mortar Origin Definitions Defs Strokes Stroke Words Sentences Sents 槽 cáo noun groove (bound form) a long, narrow channel, depression, or waterway; groove; slot; furrow; gutter; riverbed碓 duì pestle treadle-operated tilt hammer or pestle used for hulling rice or pounding grain in a mortar