What is "but-"

pre. (context organic chemistry English) Used as a combining form to denote the presence of 4 carbon atoms in the parent chain when forming names of organic compounds.

but- is a chemical prefix. It was extracted from " butyric acid". It serves as the number 4 when counting axial atoms in forming names of organic compounds. As an example, butane is an alkane with four carbons.

Category:Chemistry prefixes