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maxilla

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maxilla

1. the upper jawbone in vertebrates
2. any member of one or two pairs of mouthparts in insects and other arthropods used as accessory jaws
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

maxilla

[mak′sil·ə]
(anatomy)
The upper jawbone.
The upper jaw.
(invertebrate zoology)
Either of the first two pairs of mouthparts posterior to the mandibles in certain arthropods.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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