Opobalsam \Op`o*bal"sam\, Opobalsamum \Op`o*bal"sa*mum\, n. [L. opobalsamum, Gr. ?; ? vegetable juice + ? balsam.] (Med.) The old name of the aromatic resinous juice of the {Balsamodendron opobalsamum}, now commonly called {balm of Gilead}. See under {Balm}.