The Collaborative International Dictionary
piezo-
piezo- \piezo-\ combining form signifying piezo-electric
Douglas Harper's Etymology Dictionary
piezo-
word-forming element meaning "pressure," from comb. form of Greek piezein "to press tight, squeeze," from PIE *pi-sed-yo- "to sit upon" (cognates: 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.
Wiktionary
piezo-
pre. Forms terms relating to piezoelectricity or other effects of mechanical stress