What is "diadelphous"

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).

a. (context botany English) Having its stamens fused together at least partly by the filaments so that they form two separate bundles, or a bundle and a lone separate stamen.