- the bone of the lower jaw.
- (in birds)
- the lower part of the bill.
- the upper and lower parts of the bill.
- (in arthropods) one of the first pair of mouthpart appendages, typically a jawlike biting organ, but styliform or setiform in piercing and sucking species.
- the lower jawbone in vertebrates
- either of a pair of mouthparts in insects and other arthropods that are usually used for biting and crushing food
- either the upper or the lower part of the bill, esp the lower part
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