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The Collaborative International Dictionary
Pentagynous

Pentagynian \Pen`ta*gyn"i*an\, Pentagynous \Pen*tag"y*nous\, a. (Bot.) Of or pertaining to plants of the order Pentagyna; having five styles.

Wiktionary
pentagynous

a. (context botany English) Of or relating to plants of the order Pentagyna; having five styles.