The Collaborative International Dictionary
Synantherous
Synantherous \Syn*an"ther*ous\, a. [Pref. syn- + anther.] (Bot.) Having the stamens united by their anthers; as, synantherous flowers.
Wiktionary
synantherous
a. (context botany uncommon English) Having stamens that are fused by the anthers, usually with the filaments not being fused.