pinnate

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pinnate

, pinnated
1. like a feather in appearance
2. (of compound leaves) having the leaflets growing opposite each other in pairs on either side of the stem
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

pinnate

[′pi‚nāt]
(botany)
Having parts arranged like a feather, branching from a central axis.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.