antimonious oxide.    From Wordnet, Princeton University. 

Antimonic chloride and potassium iodide react, forming antimonious chloride and free iodine.    From Wordnik.com.  [A Text-book of Assaying: For the Use of Those Connected with Mines.] Reference

Antimony forms two series of salts, antimonious and antimonic; and advantage is taken of this in its determination volumetrically.    From Wordnik.com.  [A Text-book of Assaying: For the Use of Those Connected with Mines.] Reference