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From Biology-Online Dictionary | Biology-Online Dictionary
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1. (Science: botany) Consisting of several leaflets, or separate portions, arranged on each side of a common petiole, as the leaves of a rosebush, a hickory, or an ash. See abruptly pinnate, and Illust, under Abruptly.

2. (Science: zoology) Having a winglike tuft of long feathers on each side of the neck.

(Science: zoology) Pinnated grouse, the prairie chicken.

Origin: L. Pinnatus feathered, fr. Pinna a feather. See Pin a peg, Pen feather.