Ceylon cinnamon tree cey·lon·cin·namontree uncommon noun 1. tropical Asian tree with aromatic yellowish-brown bark; source of the spice cinnamon SynonymscinnamonCeylon cinnamonCeylon cinnamon treeCinnamomum zeylanicum Related words Broader terms laurel Parts Cinnamomum Part of cinnamon WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.