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labrum n. 上唇 上唇 Labrum \La"brum\, n.; pl. L. {Labra}, E. {Labrums}. [L.]
1. A lip or edge, as of a basin. [1913 Webster] 2. (Zool.) (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}. [1913 Webster]
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