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.