long pepper long·pep·per uncommon noun 1. slender tropical climber of the eastern Himalayas Synonymslong pepperPiper longum 2. plant bearing very hot and finely tapering long peppers; usually red Synonymscayennecayenne pepperchili pepperchilli pepperlong pepperjalapenoCapsicum annuum longum Related words Broader terms capsicumtrue pepper Parts genus CapsicumPiper Part of chilicayenne WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.