The Collaborative International Dictionary
Polyadelphous
Polyadelphian \Pol`y*a*del"phi*an\, Polyadelphous \Pol`y*a*del"phous\, a. (Bot.) Belonging to the class Polyadelphia; having stamens united in three or more bundles.
Wiktionary
polyadelphous
a. (context botany English) Having stamens combined in more than two groups.