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The Collaborative International Dictionary

Labium \La"bi*um\, n.; pl. L. Labia, E. Labiums. [L.]

  1. A lip, or liplike organ.

  2. The lip of an organ pipe.

  3. pl. (Anat.) The folds of integument at the opening of the vulva.

  4. (Zo["o]l.)

    1. The organ of insects which covers the mouth beneath, and serves as an under lip. It consists of the second pair of maxill[ae], usually closely united in the middle line, but bearing a pair of palpi in most insects. It often consists of a thin anterior part (ligula or palpiger) and a firmer posterior plate (mentum).

    2. Inner margin of the aperture of a shell.