lemon-scented gum le·mons·cen·tedgum uncommon noun 1. similar to but smaller than the spotted gum and having lemon-scented leaves Synonymslemon-scented gumEucalyptus citriodoraEucalyptus maculata citriodora Related words Broader terms eucalyptus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.