‖La‐bel″lum (lȧ‐bĕl″lŭm), n.; pl. L. Labella (–lȧ), E. Labellums (–lŭmz). [L., dim. of labrum lip.] 1. (Bot.) The lower or apparently anterior petal of an orchidaceous flower, often of a very curious shape.
2. (Zoöl.) A small appendage beneath the upper lip or labrum of certain insects.