From The Collaborative International Dictionary of English v.0.44 [gcide]:
Pinnate \Pin"nate\, Pinnated \Pin"na*ted\, adjective [L. pinnatus feathered, fr. pinna a feather. See {Pin} a peg, {Pen} feather.]
1. (Bot.) 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. (Zo["o]l.) Having a winglike tuft of long feathers on each side of the neck.
{Pinnated grouse} (Zo["o]l.), the prairie chicken.
From WordNet (r) 2.0 [wn]:
adjective
1: of a leaf shape; featherlike; having leaflets on each side of a common axis [syn: {pinnated}]
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