petr-
combining form
variants or petri- or petro-
1
a
: stone : rock
petrescent
Petricola
petrogenesis
b
: petroleum
petroporphyrins
2
: of or relating to the petrous portion of the temporal bone and
petrohyoid
Word History
Etymology
Middle French petr-, petri- & Latin petr- & New Latin petro-, from Greek petr-, petro-, from petros stone & petra rock