The Collaborative International Dictionary
Hypopharynx
Hypopharynx \Hy`po*phar"ynx\, n. [NL. See Hypo-, and Pharynx.] (Zo["o]l.) An appendage or fold on the lower side of the pharynx, in certain insects.
Wiktionary
hypopharynx
n. (context anatomy English) bottom part of the pharynx, the part of the throat that connects to the esophagus