Hypertext Webster Gateway: "maxilla"

From Webster's Revised Unabridged Dictionary (1913) (web1913)

Maxilla \Max*il"la\, n.; pl. {Maxill[ae]}. [L., dim. of mala
jaw, jawbone.]
1. (Anat.)
(a) The bone of either the upper or the under jaw.
(b) The bone, or principal bone, of the upper jaw, the
bone of the lower jaw being the mandible. [Now
commonly used in this restricted sense.]

2. (Zo["o]l.) One of the lower or outer jaws of arthropods.

Note: There are usually two pairs in Crustacea and one pair
in insects. In certain insects they are not used as
jaws, but may form suctorial organs. See Illust. under
{Lepidoptera}, and {Diptera}.

From WordNet (r) 1.7 (wn)

maxilla
n : the upper jawbone in vertebrates ; it is fused to the
cranium [syn: {upper jaw}, {upper jawbone}]

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