a. [f. L. antimōni-um + -OUS.] Of the nature of, or containing, antimony. In Chem. applied to compounds of antimony in which it combines as a triad; as Antimonious chloride SbCl3; Antimonious acid, formerly applied to Antimony tetroxide, afterwards to Antimonious oxide or Antimony trioxide Sb2O3.
1833. Penny Cycl., I. 87/2. Acids, Acetic, Antimonic, Antimonious, etc.
1876. Harley, Mat. Med., 289. The antimonious oxyde sublimes with difficulty in needles.
