- The exposed part of the lip, especially the small elevation at the termination of the philtrum.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for prolabium
The central portion or prolabium is usually smaller than normal, and is closely adherent to the os incisivum.
In aggravated cases, the os incisivum and prolabium are adherent to the end of the nose.
With regard to the most delicate part of the operation, the management of the prolabium.A Manual of the Operations of Surgery