three-winged; having three wings or winglike expansions.
Origin of tripterous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(of fruits, seeds, etc) having three winglike extensions or parts
Word Origin for tripterous
C19: from tri- + Greek -pteros, from pteron wing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012