Diplopterygium dip·lop·te·rygium uncommon noun 1. scandent thicket-forming ferns of Asia to western Pacific Synonymsgenus Diplopterygium Related words Word family Diplopterygium longissimum Broader terms fern genus Parts Gleicheniaceae Part of giant scrambling fern WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.