Thio-

The prefix thio-, when applied to a chemical, such as an ion, means that an oxygen atom in the compound has been replaced by a sulfur atom. This term is often used in organic chemistry. For example, from the word ether, referring to an oxygen-containing compound having the general chemical structure R–O–R′, where R and R′ are organic functional groups and O is an oxygen atom, comes the word thioether, which refers to an analogous compound with the general structure R–S–R′, where S is a sulfur atom covalently bonded to two organic groups.[1] A chemical reaction involving the replacement of oxygen to sulfur is called thionation or thiation.

Thio- can be prefixed with di- and tri- in chemical nomenclature.

The word derives from Greek θεῖον theîon = "sulfur" (which occurs in Greek epic poetry as θέ(ϝ)ειον théweion and may come from the same root as Latin fumus (Indo-European dh-w) and may have originally meant "fumigation substance".)

Examples
gollark: That's an mp4 but with an unusual codec.
gollark: Ah, it *is* codecs!
gollark: I will fffmpegize™ it.
gollark: codecs, perhaps.
gollark: It does preview videos.

See also

References
  1. March, Jerry (1985), Advanced Organic Chemistry: Reactions, Mechanisms, and Structure (3rd ed.), New York: Wiley, ISBN 0-471-85472-7
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