槽儿 cáor groove Definitions Defs Origin Strokes Stroke Words Sentences Sents cáor groove 槽 cáo noun groove (bound form) a long, narrow channel, depression, or waterway; groove; slot; furrow; gutter; riverbed儿 兒 r particleaffix [erhua suffix] A suffix attached to a word to form a retroflex ending, often indicating a small size, a sense of familiarity, or turning a word into a noun.cáor sommelier · trough 槽 cáo noun trough (bound form) a long, narrow container for animal feed or liquids; manger; vat儿 兒 r particleaffix [erhua suffix] A suffix attached to a word to form a retroflex ending, often indicating a small size, a sense of familiarity, or turning a word into a noun.