Etymology
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pinnate (adj.)

"shaped like a feather; resembling a feather in structure," 1727, from Latin pinnatus "feathered, winged," from pinna "feather, wing" (from PIE root *pet- "to rush, to fly").

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Definitions of pinnate

pinnate (adj.)
(of a leaf shape) featherlike; having leaflets on each side of a common axis;
Synonyms: pinnated
From wordnet.princeton.edu