the jawbone 下颌骨 
the upper or lower part of a bird’s beak 鸟的上喙（或下喙） either of the two parts that are at the front and on either side of an insect’s mouth, used especially for biting and crushing food （昆虫的）上颚 
Word Originlate Middle English: from Old French, or from late Latin mandibula, from mandere ‘to chew’.