chilli pepper chil·li·pep·per uncommon noun 1. plant bearing very hot and finely tapering long peppers; usually red Synonymscayennecayenne pepperchili pepperchilli pepperlong pepperjalapenoCapsicum annuum longum Related words Broader terms capsicum Parts genus Capsicum Part of chilicayenne WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.