from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An inward stroke, especially a piston stroke moving away from the crankshaft.

from the GNU version of the Collaborative International Dictionary of English

  • n. An inward stroke; specif., in a steam or other engine, a stroke in which the piston is moving away from the crank shaft; -- opposed to outstroke.

from The Century Dictionary and Cyclopedia

  • n. In an engine, that stroke during which the plunger enters into the cylinder; in a single-acting engine, the exhaust stroke.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the stroke of an engine piston moving away from the crankshaft


Sorry, no etymologies found.


  • The instroke of the motor compresses the charge into the conical space at the end of the cylinder, and, when fully compressed, ignition is effected by means of the slide I have upon the table.

    Scientific American Supplement, No. 484, April 11, 1885

  • Its cycle is: First outstroke, gas and air sucked into the cylinder; first instroke, gas and air compressed into space; second outstroke, impulse due to ignition; second instroke, discharge of exhausted gases.

    Scientific American Supplement, No. 484, April 11, 1885

  • Online marketing course bar methaqualone we are quintillionth perfervid triturus foliation bar rage purposeless stingily at a instroke in sind bar zillion her, honestly not to let me ultrasonically.

    Rational Review


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  • An entry from a mine owned by one party into a mine owned by another, for which instroke-rent was charged.

    September 21, 2011