01 n. One of the small divisions of a decompound frond or leaf. See Illust. of Bipinnate leaf, under Bipinnate.
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1.
One of the small divisions of a decompound frond or leaf. See Illust. of Bipinnate leaf, under Bipinnate.(Bot.) See: Bipinnate
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2.
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.(Zool.)