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instroke

[in-strohk] /ˈɪnˌstroʊk/
noun
1.
a stroke, in an inward direction.
2.
(in an engine) the stroke during which the piston moves into the cylinder.
Origin
1885-1890
1885-90; in + stroke1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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