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The Collaborative International Dictionary
Synanthesis

Synanthesis \Syn`an*the"sis\, n. [NL., fr. Gr. sy`n with + Gr. ? bloom.] (Bot.) The simultaneous maturity of the anthers and stigmas of a blossom.
--Gray.

Wiktionary
synanthesis

n. (context botany English) The simultaneous maturity of the anthers and stigmas of a blossom.