tomato hornworm to·ma·to·hornworm uncommon noun 1. large green white-striped hawkmoth larva that feeds on tomato and potato plants; similar to tobacco hornworm Synonymstomato hornwormpotato wormManduca quinquemaculata Related words Broader terms caterpillar WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
