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The Collaborative International Dictionary
Unijugate

Unijugate \U*nij"u*gate\, a. [Uni- + L. jugum yoke, pair: cf. L. unijugus having one yoke.] (Bot.) Having but one pair of leaflets; -- said of a pinnate leaf.

Wiktionary
unijugate

a. (context botany of a pinnate leaf English) Having only one pair of leaflets.