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The Collaborative International Dictionary
Bipennate

Bipennate \Bi*pen"nate\, Bipennated \Bi*pen"na*ted\, a. [Pref. bi- + pennate: cf. L. bipennis. Cf. Bipinnate.] Having two wings. ``Bipennated insects.''
--Derham. [1913 Webster] ||

Wiktionary
bipennate

a. 1 (context medicine anatomy zoology English) Of, pertaining to, or having the nature of a muscle, the fibres of which attach to a tendon on two sides (as a feather barbed on both sides). 2 (context botany of leaves English) bipinnate (pinnate and having a pinnate leaflet).