[pin-eyt, -it]
resembling a feather, as in construction or arrangement; having parts arranged on each side of a common axis: a pinnate branch; pinnate trees.
Botany. (of a leaf) having leaflets or primary divisions arranged on each side of a common stalk.
Also, pinnated.

1695–1705; < Latin pinnātus feathered, winged. See pinna, -ate1

pinnately, pinnatedly, adverb
multipinnate, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pinnate or pinnated (ˈpɪneɪt, ˈpɪnɪt)
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
[C18: from Latin pinnātus, from pinna feather]
pinnated or pinnated
[C18: from Latin pinnātus, from pinna feather]
'pinnately or pinnated
pin'nation or pinnated

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pinnate   (pĭn'āt')  Pronunciation Key 

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Having parts or divisions arranged on each side of a common axis in the manner of a feather. Ash, hickory, and walnut trees have pinnate leaves.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Leaves are alternate, about six inches long, pinnate lobed or coarsely toothed.
They alternate and have an average of five leaflets per pinnate compound.
It bears handsome, darkish pinnate leaves and rosy trumpet flowers in profusion at many times of the year.
Subsequent rosette leaves oblanceolate, entire to pinnate-lobed.
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