WordWeight : Weighing the Words

Pronunciation : Pin"na, n.; pl. Pinn
Part of Speech : E.
Etymology : [L., a feather.]
Definition : 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?l.)

Defn: One of the divisions of a pinnate part or organ.

3. Etym: [L. pinna, akin to Gr. (Zo?l.)

Defn: 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.)

Defn: The auricle of the ear. See Ear.

Pinnas.
Source : Webster's Unabridged Dictionary, 1913