piezo- Look up piezo- at Dictionary.com
word-forming element meaning "pressure," from Greek piezein "to press tight, squeeze," from PIE *pi-sed-yo- "to sit upon" (source also of Sanskrit pidayati "presses, oppresses"), from *pi "on," short for *epi (see epi-) + *sed- (1) "to sit" (see sedentary). First in piezometer (1820); in common use in word formation from c. 1900.