petrology

n [U] scientific study of rocks 岩石学.

petard, peter, petit bourgeois, petite, petition, petitioner, petrel, petrifaction, petrify, petro-, petrochemical, petrodollar, petroglyph, petrography, petrol, petrol bomb, petrol fumes, petrol tank, petroleum, petrologist, petticoat, pettifogging, pettily, pettiness, pettish, pettishly, pettishness, petty, petty cash, petty larceny, petty officer, petulance, petulant, petulantly, petunia, Peugeot, pew, pewit, pewter, peyote,