pinnae Definition

pinna
noun pinnae

1. anatomy.
In mammals: the part of the outer ear that projects from the head and that in certain mammals can be moved independently in order to detect the direction of sounds.
2. In a compound leaf: one of the leaflets on either side of the midrib.
3. In birds: a feather or wing.
4. In fish: a fin.

Etymology: 18c: Latin, meaning ‘feather' or ‘wing'.