pinna

• POS: Noun
• HYPHEN: pin=na

CIDE DICTIONARY

pinna, n. [L., a feather.].

•  A leaflet of a pinnate leaf. See Illust. of Bipinnate leaf, under Bipinnate.  [1913 Webster]
•  One of the divisions of a pinnate part or organ.  [1913 Webster]
•  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.  [1913 Webster]
•  The auricle of the ear. See Ear.  [1913 Webster]

OXFORD DICTIONARY

pinna, n. (pl. pinnae or pinnas)
1 the auricle; the external part of the ear.
2 a primary division of a pinnate leaf.
3 a fin or finlike structure, feather, wing, etc.

Etymology

L, = penna feather, wing, fin