isobutane

[ ahy-suh-byoo-teyn, -byoo-teyn ]

/ ˌaɪ səˈbyu teɪn, -byuˈteɪn /

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noun Chemistry.

a colorless, flammable gas, C4H10, used as a fuel, as a refrigerant, and in the manufacture of gasoline by alkylation.

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Origin of isobutane

First recorded in 1875–80; iso- + butane