The Collaborative International Dictionary
Biconjugate
Biconjugate \Bi*con"ju*gate\, a. [Pref. bi- + conjugate, a.]
(Bot.)
Twice paired, as when a petiole forks twice.
--Gray.
Wiktionary
biconjugate
a. 1 (context botany English) paired twice 2 (context mathematics English) conjugate in two ways