Eth-

eth- is a chemical prefix. It was extracted from "ethyl". It serves as the number 2 when counting axial atoms in forming names of organic compounds.

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v t e Organic chemistry affixes
Carbon-based	-ane (alkane) -ene (alkene) -ine (unsaturated hydrocarbon) -yne (alkyne) alk- (nonaromatic hydrocarbon) ar- (aromatic) cyclo- (cyclic)
Oxygen-based	-al (aldehyde) -oate (ester) -oic acid (carboxylic acid) -ol (alcohol) -one (ketone) -ose (sugar)
Nitrogen-based	-ine (alkaloid) aza- (N replaces C)
Sulfur-based	thio- (S replaces O)
Counting axial atoms	meth- (1) eth- (2) prop- (3) but- (4) (and the rest are ordinary Greek/Latin prefixes)
Other	-ase (enzyme) -yl (radical)

Eth-

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