Exorhiza \Ex`o*rhi"za\ ([e^]ks`[-o]*r[imac]"z[.a]), n.; pl. {Exorhiz[ae]} (-z[=e]). [NL. fr. Gr. 'e`xw outside + 'ri`za root.] (Bot.) A plant Whose radicle is not inclosed or sheathed by the cotyledons or plumule. --Gray. Exorhizal