melastomatáceo , a . ( Of the Gr. ?, black,?,?, mouth, and -áceo ). 1. adj. Bot. He said plants Woody or herbaceous, Angiosperm dicots, living in tropical countries, mainly in South America, which resemble the Myrtaceae by many of his characters, but differ from them because they lack glands that produce essential oil in vegetative organs; e.g., the cordobán. U t. c. s. f. 2. f. pl. Bot. These plant family. O RTOGR. ESCR. with may. initial.