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Webster 1913 Edition

Noun.

[L.

pinnula

, dim. of

pinna

feather: cf. F.

pinnule

(Bot.)

One of the small divisions of a decompound frond or leaf. See Illust. of

Bipinnate leaf

, under

(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.

pinnule ‎(plural pinnules)