ˌpēəˈzäməd.ə(r), ˌpīə- noun
Etymology: piezo- + -meter
1. : an instrument for measuring pressure ; specifically : a gage joined to a main for indicating the pressure of liquid or gas inside
2. : an apparatus for determining the compressibility of materials ; specifically : a vessel for measuring the change in volume of a solid, liquid, or gas when subjected to hydrostatic pressure