chili pepper chi·li·pep·per uncommon noun 1. plant bearing very hot and finely tapering long peppers; usually red Synonymscayennecayenne pepperchili pepperchilli pepperlong pepperjalapenoCapsicum annuum longum 2. very hot and finely tapering pepper of special pungency Synonymschilichili pepperchillichillychile Related words Broader terms hot peppercapsicum Narrower terms jalapenocayenne Parts cayennechili powdergenus Capsicum Part of chilicayenne WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.