Pinna

Part of speech: noun (n.)

1. A leaflet of a pinnate leaf. See Illust. of Bipinnate leaf, under Bipinnate.

2. One of the primary divisions of a decompound leaf.

3. One of the divisions of a pinnate part or organ.

4. Any species of Pinna, a genus of large bivalve mollusks found in all warm seas. The byssus consists of a large number of long, silky fibers, which have been used in manufacturing woven fabrics, as a curiosity.

5. The auricle of the ear. See Ear.