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The Collaborative International Dictionary of English v.0.48 (gcide)

Labellum \La*bel"lum\ (l[.a]*b[e^]l"l[u^]m), n.; pl. L.
{Labella} (l[.a]*b[e^]l"l[.a]), E. {Labellums}
(l[.a]*b[e^]l"l[u^]mz). [L., dim. of labrum lip.]
1. (Bot.) The lower or apparently anterior petal of an
orchidaceous flower, often of a very curious shape.
[1913 Webster]

2. (Zool.) A small appendage beneath the upper lip or labrum
of certain insects.
[1913 Webster]

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