a silver-white metallic chemical element used esp as a constituent of alloys to give added strength and hardness: symbol Sb, atomic number 51
antimonial /-ʹmohnyəl, -ni·əl/ adj
antimonious /-ʹmohni·əs/ adj
[Middle English antimonie from medieval Latin antimōnium, perhaps modification of Arabic ithmid, of Hamitic origin]