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sulpha-

In the US sulfa-

A drug derived from sulphanilamide.

The first element of sulphanilamide.

Sulphanilamide (from sulphur, plus aniline, of which it is a derivative, plus amide) is a synthetic compound with antibacterial properties which is the basis of the sulphonamide (or sulpha) drugs. Though they have for many purposes been replaced by antibiotics, a substantial group of them is still in use, of which some examples are sulphacetamide, sulphadiazine, sulphadimidine, sulphamethoxazole, sulphapyridine, and sulphasalazine.