D defs.my
Entry 1 sense Webster, 1913

Instroke

· In·stroke · IPA
01 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.
  1. 1.
    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.