red pepper red·pep·per uncommon noun 1. ground pods and seeds of pungent red peppers of the genus Capsicum Synonymscayennecayenne pepperred pepper 2. very hot red peppers; usually long and thin; some very small Synonymstabascored pepper Related words Broader terms hot pepperflavorer Parts tabasco pepperTabascocayenne WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.