a. [ Pref. met- + antimonic. ] (Chem.) (a) Pertaining to, or designating, an acid (formerly called antimonic acid) analogous to metaphosphoric acid, and obtained as a white amorphous insoluble substance, (HSbO3). (b) Formerly, designating an acid, which is now properly called pyroantimonic acid, and analogous to pyrophosphoric acid. [ 1913 Webster ]