sweet pepper plant sweet·pep·perp·lant uncommon noun 1. plant bearing large mild thick-walled usually bell-shaped fruits; the principal salad peppers Synonymssweet pepperbell pepperpimentopimientopaprikasweet pepper plantCapsicum annuum grossum Related words Broader terms capsicum Parts genus Capsicum Part of sweet pepperpaprika WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.