I. sul ‧ fate /ˈsʌlfeɪt/ BrE AmE noun [uncountable and countable]
the American spelling of ↑ sulphate
II. sul ‧ phate BrE AmE British English , sulfate American English /ˈsʌlfeɪt/ noun [uncountable and countable]
a ↑ salt formed from ↑ sulphuric acid :
copper sulphate