hyl

noun1

1. •
   (no longer used) A unit of mass that is accelerated at a rate of 1 meter per second squared (1 m/s²) by a force of 1 kilogram-force, equivalent to 9.80665 kilograms.

   • A mass of one hyl gets accelerated at a rate of one meter per square second by a force of one kilogram-force (namely, 9.80665 N). — 2000