Noun, pl. labia
1. A liplike structure; especially one of the two pairs of folds of skin either side of the vulva. (wiktionary.org)
2. There are two pairs of labia (lips) at the entrance to the vagina. They are the labia majora (the larger outside pair) and the labia minora (the smaller inside pair). Together they form part of the vulva (the female external genitalia). (biology-online.org)
1. The lip of a labiate corolla. (wiktionary.org)
1. The lip against which pressured air is driven in a flue pipe in an organ. (wiktionary.org)
Word origin: Latin word for lip.