Wiktionary
antimony trichloride
n. (context inorganic compound English) A soft, colourless solid, SbCl3, that has some use as an analytical reagent
Wikipedia
Antimony trichloride
Antimony trichloride is the chemical compound with the formula SbCl. The soft colorless solid with a pungent odor was known to the alchemists as butter of antimony.