无灰粉笔 wúhuīfěnbǐ dustless chalk Origin Definitions Defs Strokes Stroke Words Sentences Sents 无 無 wú adjectiveverb to not have to not have; there is no; lack; (as prefix) non-; un-; -less灰 huī noun dust fine particles of dirt or powder粉笔 粉筆 fěnbǐ noun chalk chalk; stick of chalk used for writing on a blackboard