PINNULES

Noun

pinnules

plural of pinnule

Source: Wiktionary

PINNULE

Pin"nule, n. Etym: [L. pinnula, dim. of pinna feather: cf. F. pinnule.]

1. (Bot.)

Definition: One of the small divisions of a decompound frond or leaf. See Illust. of Bipinnate leaf, under Bipinnate.

2. (Zoöl.)

Definition: 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 Edition