labium

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labium

1. a lip or liplike structure
2. any one of the four lip-shaped folds of the female vulva
3. the fused pair of appendages forming the lower lip of insects
4. the lower lip of the corolla of labiate flowers
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

labium

[′lā·bē·əm]
(biology)
A liplike structure.
The lower lip, as of a labiate corolla or of an insect.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.