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Webster's Dictionary (1865)

Bi-pīn'nate or Bi-pīn'nā-ted, a.

adjective

a. [Lat. bis, twice, and Eng. pinnate, pinnated, q. v.; Fr. bipinné.] (Bot.) Twice pinnate. Gray.

A drawing of a bipinnate leaf with several pairs of leaflets branching from a central stem.
Bipinnate Leaf.