1. Of or relating to the lips or labia.
2. Linguistics Articulated mainly by closing or partly closing the lips, as the sounds (b), (m), or (w).
1. Linguistics A labial consonant.
2. Music See flue1.
[Medieval Latin labiālis, from Latin labium, 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.