(Britain) Alternative spelling of ammonium sulfate

(US, inorganic chemistry) An inorganic chemical compound, (NH₄)₂SO₄, commonly used as a fertilizer and as a food additive (E517) used as an improving agent.

Alternative spelling of lead sulfate

(inorganic chemistry) The insoluble lead salt or sulfuric acid, PbSO₄, that forms in lead-acid batteries

(organic chemistry) The organic sulfur compound (CH₃)₂S that is a breakdown product of many biological sulfur compounds; it has a number of industrial uses

A purple swamphen, Porphyrio porphyrio.

(inorganic chemistry) The sulfide of mercury, HgS, that occurs as the mineral cinnabar.

(organic chemistry) The methyl ester of sulfuric acid, (CH₃)₂SO₄, used as a methylating agent in organic chemistry

(pharmacology) A beta-lactamase inhibitor that is usually administered in the form of its sodium salt C₈H₁₀NNaO₅S in combination with a beta-lactam antibiotic (as ampicillin).

(inorganic chemistry) The binary sulfide of ferrous iron, FeS, that occurs in several minerals