pleximeter

• plexometer

From Ancient Greek πλῆξις (plêxis, “stroke, percussion”) +‎ -meter.

pleximeter (plural pleximeters)

1. (medicine) Something used to absorb the energy generated by the strike from a percussion hammer, during medical percussion. Usually this is simply the doctor's hand.
   1. a small, hard plate, made of ivory, bone, or rubber, placed in contact with the body to absorb such a shock.

• “pleximeter”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.