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noun Aviation.
  1. gasoline for use in piston-engined aircraft.

Origin of avgas

First recorded in 1940–45; av(iation) + gas(oline)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for avgas

Historical Examples

  • Loaded an ore boat with avgas and ammo and ran it up the Seaway.

    The Syndic

    C.M. Kornbluth

  • Food was brought to them from time to time, but it tasted like avgas.

    The Syndic

    C.M. Kornbluth

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