butane

i-butane (2-methyl-propane)

Meaning

A hydrocarbon (either of the two isomers of C₄H₁₀ n-butane, and 2-methyl-propane) found in gaseous petroleum fractions.
The n-butane isomer only.

IUPAC nomenclature, from but- + -ane, the former is derived from the same stem as the foul-smelling carboxylic acid liberated in rancid butter, "butyric acid", hence cognate with butter.

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