Hypertext Webster Gateway: "Pinnas"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pinna \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}.
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