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 epipharynx
When the flea is feeding, the epipharynx and mandibles are thrust into the skin of the victim, the labium serving as a guide.
The piercing proboscis consists of three long needle-like organs, the epipharynx and mandibles, and a lower lip or labium.
Behind the labrum arises a process—the epipharynx—which in some blood-sucking insects becomes a formidable piercing-organ.