1 definition found From The Collaborative International Dictionary of English v.0.48 [gcide]: 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. [1913 Webster] 2. (Zool.) One of the divisions of a pinnate part or organ. [1913 Webster] 3. [L. pinna, akin to Gr. ?.] (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. [1913 Webster] 4. (Anat.) The auricle of the ear. See {Ear}. [1913 Webster]
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