Jamaica quassia ja·mai·ca·quassia uncommon noun 1. similar to the extract from Quassia amara SynonymsJamaica quassia 2. West Indian tree yielding the drug Jamaica quassia SynonymsJamaica quassiabitterwoodPicrasma excelsaPicrasma excelsum Related words Broader terms bitterwood treequassia Parts PicrasmaJamaica quassia Part of Jamaica quassia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.