Op`o·bal'samOp`o*bal'sa*mum noun [ Latin opobalsamum , Greek ...; ... vegetable juice + ... balsam.] (Medicine) The old name of the aromatic resinous juice of the Balsamodendron opobalsamum , now commonly called balm of Gilead . See under Balm . Found on http://www.encyclo.co.uk/webster/O/25