Definition of: pinnate

(pin′āt, -it) adjective
1. Bot. Having the shape or arrangement of a feather: said of compound leaves or leaflets arranged on each side of a common axis: when terminated by a single leaf, odd–pinnate; when lacking a terminal leaf, abruptly pinnate.
2. Having winglike parts or appendages. Also pin′nat·ed. [<L pinnatus feathered <pinna a feather, wing]
—pin′nate·ly adverb
—pin·na′tion noun