instroke

instroke

[in-strohk]
noun
1.
a stroke, in an inward direction.
2.
(in an engine) the stroke during which the piston moves into the cylinder.

Origin:
1885–90; in + stroke1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
instroke

noun
the stroke of an engine piston moving away from the crankshaft 
WordNet® 3.0, © 2006 by Princeton University.
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