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.
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.
© Webster 1913.