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isobutane

[ahy-suh-byoo-teyn, -byoo-teyn]
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noun Chemistry.
  1. 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018