Pinnule
Pronunciation : Pin"nule
Part of Speech : n.
Etymology : [L. pinnula, dim. of pinna feather: cf. F. pinnule.]
Definition : 1. (Bot.)
Defn: One of the small divisions of a decompound frond or leaf. See Illust. of Bipinnate leaf, under Bipinnate.
2. (Zo?l.)
Defn: 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.
Source : Webster's Unabridged Dictionary, 1913