The American Heritage® Dictionary of the English Language, 4th Edition
n. A colorless or pale yellow liquid, C3H3NS, containing a five-member ring composed of a nitrogen atom, a sulfur atom, and three carbon atoms, used in making dyes and fungicides.
n. Any of a class of unsaturated heterocyclic compounds containing a ring of three carbon atoms, a sulphur and an nitrogen atom; especially the simplest one, C3H3SN.
Word Usage
"Cooked Tomatoes When fresh tomatoes are cooked down to make a thick sauce, they gain some flavors—notably rose- and violet-like fragments of the carotenoid pigments—but they lose the fresh “green” notes provided by unstable fragments of fatty acids and by a particular sulfur compound a thiazole."