下颚骨 xià'ègǔ lower jawbone Origin Definitions Defs Strokes Stroke Words Sentences Sents 下 xià locative below low place; bottom; underneath; (bound form) used after a noun to indicate a scope, condition, or time颚骨 顎骨 ègǔ jawbone The bones forming the structure of the mouth, including the upper and lower jaws. Also referred to as 颌骨 hégǔ or 腭骨 ègǔ.