The bone of the lower jaw, esp. if in one piece.

【解】下颔骨。

In birds, either jaw.

(鸟的)上部或下部；喙。

In arthropods, the first pair of mouth parts, variously modified for biting, crushing, chewing, sucking, or piercing.

(节族动物的)大颚(用来咬、咬碎、嚼、吸吮或刺)。