Chem. An adaptation of L. butyrum BUTTER, sometimes used in technical senses.
1840. H. Cleeve, in Jrnl. Agric. Soc., I. II. 321. Butyr, (or, as it is commonly called, butter) of antimony.
1882. Chemist & Drug., XXIV. 56/1. Butyr of antimony, oil of vitriol, etc.
