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[trip-uh l-ik-span-shuh n] /ˌtrɪp əl ɪkˈspæn ʃən/
noting a power source, especially a steam engine, using the same fluid at three successive stages of expansion to do work in three or more cylinders. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for triple-expansion
Historical Examples
  • The triple-expansion engine is cutting down ocean freight, making distance of no account.

    Harding of Allenwood Harold Bindloss
  • She is barquentine rigged, and has triple-expansion engines giving her a speed under steam of nine to ten knots.


    Sir Ernest Shackleton
  • How does a triple-expansion engine differ from an ordinary steam-engine?

    Commercial Geography

    Jacques W. Redway
  • The ship was driven by steam, the triple-expansion engine being 500-horse power and the rate of speed twenty-five miles an hour.

    The Goddess of Atvatabar William R. Bradshaw
  • I know a triple-expansion ass not a hundred miles from here; so fire away.

    The Mayor of Warwick

    Herbert M. Hopkins

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