One of the mysteries of the English language finally explained.
Any of a class of compounds, many of which have fungicidal properties, whose molecules contain a ring of one oxygen, one sulphur, and four carbon atoms; specifically (more fully "1,4-oxathiin") a monocyclic compound in which the sulphur and oxygen atoms are at opposite vertices.
1940s. From oxa- + thio- + -in.
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