labium

Any of four folds of tissue of the female external genitals.

A liplike structure, such as that forming the floor of the mouth of certain invertebrates, especially insects.

The inner margin of the opening of a gastropod shell.

One of the liplike divisions of a bilabiate corolla.

In anatomy and zoology, a lip or lip-like part. Specifically.

In bot:

The lower or anterior lip of a bilabiate corolla

In Isoëtes, a lip-like structure formed by the lower margin of the foveola.

[capitalized] A genus of ichneumon-flies, with one small New Guinean species