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The Collaborative International Dictionary of English v.0.48 (gcide)

Pinnule \Pin"nule\, n. [L. pinnula, dim. of pinna feather: cf.
F. pinnule.]
1. (Bot.) One of the small divisions of a decompound frond or
leaf. See Illust. of {Bipinnate leaf}, under {Bipinnate}.
[1913 Webster]

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.
[1913 Webster]

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