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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Labrum \La"brum\, noun; pl. L. {Labra}, E. {Labrums}. [L.]
1. A lip or edge, as of a basin.
2. (Zo["o]l.) (a) An organ in insects and crustaceans covering the upper part of the mouth, and serving as an upper lip. See Illust. of {Hymenoptera}. (b) The external margin of the aperture of a shell. See {Univalve}.
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