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]
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
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