下颌骨

下颌骨	xià hé gǔ	lower jaw / mandible
下	xià	down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action
下颌	xià hé	lower jaw / mandible
颌	hé	(bound form) jaw
骨	gū	used in 骨碌碌 / used in 骨碌
骨	gǔ	bone