The Collaborative International Dictionary
Obdiplostemonous
Obdiplostemonous \Ob*dip`lo*stem"o*nous\, a. [Pref. ob- +
diplostemonous.] (Bot.)
Having twice as many stamens as petals, those of the outer
set being opposite the petals; -- said of flowers.
--Gray.
Wiktionary
obdiplostemonous
a. (context botany of flowers English) Having two sets of stamens in alternating whorls, with the outer whorl opposite the petals.