Chem. [f. TRI- 5 + SULPHATE.] A compound formed from three molecules of sulphuric acid, H2SO4, by replacement of the hydrogen by a metal or radical, and thus containing three SO4 groups; e.g., aluminium trisulphate, Al2(SO4)3; glyceryl and hydrogen trisulphate, (C3H5)″′H3(SO4)3.
1880. Roscoe & Schorlemmer, Treat. Chem., II. ii. 312. Antimony Trisulphate, Sb2(SO4)3,… crystallizes … in long glistening silky needles.
