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The Collaborative International Dictionary
Didynamous

Didynamous \Di*dyn"a*mous\, a. (Bot.) Of or pertaining to the Didynamia; containing four stamens disposed in pairs of unequal length.

Wiktionary
didynamous

a. (context botany English) Of or pertaining to the Didynamia; containing four stamens disposed in pairs of unequal length.