Definition of antimony chloride
: either of two chlorides of antimony:
a : the trichloride SbCl3 obtained as a colorless hygroscopic caustic crystalline solid from antimony and chlorine and used chiefly in coloring metals (such as iron, zinc), as a catalyst, and as a mordant
— called also butter of antimony
b : the pentachloride SbCl5 obtained as a colorless to reddish yellow caustic oily liquid with an offensive odor and used chiefly as a chlorine carrier in organic synthesis and as a catalyst
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