check nut (cheknut)

In mach., a nut used as a stop for adjusting the length of a screw, or to prevent the turning turning of the main nut when once properly adjusted. check-rail (chek'ral) (chek'ral), n. trivance at the cro ing from one line of rails to another, or at a siding, for allowing trains In railroads, a con to run on to or move into the other line or siding.