Definitions for: Pinna

[n] the externally visible cartilaginous structure of the external ear
[n] division of a usually pinnately divided leaf

Webster (1913) Definition: Pin"na, n.; pl. Pinn[ae], E. Pinnas. [L., a
feather.]
1. (Bot.)
(a) A leaflet of a pinnate leaf. See Illust. of {Bipinnate
leaf}, under Bipinnate.
(b) One of the primary divisions of a decompound leaf.

2. (Zo["o]l.) One of the divisions of a pinnate part or
organ.

3. [L. pinna, akin to Gr. ?.] (Zo["o]l.) 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.

4. (Anat.) The auricle of the ear. See Ear.

Synonyms: auricle, ear, pinnule

See Also: cartilaginous structure, cauliflower ear, ear lobe, earlobe, external ear, leaflet, outer ear, tragus

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