1. (noun)neem, neem tree, nim tree, margosa, arishth, Azadirachta indica, Melia Azadirachta large semi-evergreen tree of the East Indies; trunk exudes a tenacious gum; bitter bark used as a tonic; seeds yield an aromatic oil; sometimes placed in genus Melia Synonyms: neem, margosa, arishth, nim tree, neemtree