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).
[1913 Webster]