Agrostemma ag·ros·temma uncommon noun 1. a caryophylloid dicot genus including corn cockles Synonymsgenus Agrostemma Related words Word family Agrostemma githago Broader terms caryophylloid dicot genus Parts Caryophyllaceae Part of corn cockle WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.