The Collaborative International Dictionary
Diadelphian
Diadelphian \Di`a*del"phi*an\, Diadelphous \Di`a*del"phous\, a. [Cf. F. diadelphe.] (Bot.) Of or pertaining to the class Diadelphia; having the stamens united into two bodies by their filaments (said of a plant or flower); grouped into two bundles or sets by coalescence of the filaments (said of stamens).
Wiktionary
diadelphian
a. (context botany English) Of or relating to the class Diadelphia; having the stamens united into two bodies by their filaments (said of a plant or flower); grouped into two bundles or sets by coalescence of the filaments (said of stamens).