Pinna

·noun One of the divisions of a pinnate part or organ.

II. Pinna ·noun One of the primary divisions of a decompound leaf.

III. Pinna ·noun The auricle of the ear. ·see Ear.

IV. Pinna ·noun A leaflet of a pinnate leaf. ·see ·Illust. of Bipinnate leaf, under Bipinnate.

V. Pinna ·noun 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.