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3 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Pin·na n.; pl. Pinnæ E. Pinnas
 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. Zool. One of the divisions of a pinnate part or organ.
 3.  Zool. 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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From: Webster's Revised Unabridged Dictionary (1913)

 Pin·nule n.
 1. Bot. One of the small divisions of a decompound frond or leaf. See Illust. of Bipinnate leaf, under Bipinnate.
 2. Zool. Any one of a series of small, slender organs, or parts, when arranged in rows so as to have a plumelike appearance; as, a pinnule of a gorgonia; the pinnules of a crinoid.
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From: WordNet (r) 2.0

 bipinnate leaf
      n : having pinnate leaflets; as ferns