n. pl. la·bi·a (-bē-ə)
1. Anatomy Any of four folds of tissue of the female external genitals.
a. A liplike structure, such as that forming the floor of the mouth of certain invertebrates, especially insects.
b. The inner margin of the opening of a gastropod shell.
3. Botany One of the liplike divisions of a bilabiate corolla.
[Latin, lip; see leb- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.