adjective Botany.
pinnate, as a leaf, with the divisions also pinnate.

1785–95; < Neo-Latin bipinnātus. See bi-1, pinnate

bipinnately, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bipinnate (baɪˈpɪnˌeɪt)
(of pinnate leaves) having the leaflets themselves divided into smaller leaflets

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

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Relating to compound leaves that grow opposite each other on a larger stem; twice-compound or twice-pinnate. Bipinnate leaves have a feathery appearance. The acacia, coffeetree, and silktree have bipinnate leaves.
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