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The Collaborative International Dictionary
Pinnas

Pinna \Pin"na\, n.; pl. Pinn[ae], E. Pinnas. [L., a feather.]

  1. (Bot.)

    1. A leaflet of a pinnate leaf. See Illust. of Bipinnate leaf, under Bipinnate.

    2. 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.

Wiktionary
pinnas

n. (plural of pinna English)

Usage examples of "pinnas".

So returning safe to the Fort, once more staied the pinnas her flight for England, which til his returne could not set saile, so extreme was the weather and so great the frost.