D defs.my
Entry 1 sense Webster, 1913

Countershaft

/(koun"t?r-sh?ft`)/ · Coun·ter·shaft · IPA
01 n. An intermediate shaft; esp., one which receives motion from a line shaft in a factory and transmits it to a machine.
  1. 1.
    An intermediate shaft; esp., one which receives motion from a line shaft in a factory and transmits it to a machine.(Mach.)