| NONPETROLEUM | • nonpetroleum adj. (Of fuel) Not petroleum-based, not containing petroleum. • NONPETROLEUM adj. not derived from petroleum. |
| PETROCHEMIST | • petrochemist n. One who studies or works in petrochemistry. • PETROCHEMIST n. someone who studies petrochemistry or works in the petrochemical industry. |
| PETRODOLLARS | • petrodollars n. Plural of petrodollar. • petrodollars n. Money earned through the sale of petroleum. • PETRODOLLAR n. a dollar's worth of foreign exchange obtained by a petroleum exporting country through sales abroad. |
| PETROGENESES | • petrogeneses n. Plural of petrogenesis. • PETROGENESIS n. formation or development of rocks. |
| PETROGENESIS | • petrogenesis n. The branch of petrology dealing with the origin of igneous rocks. • PETROGENESIS n. formation or development of rocks. |
| PETROGENETIC | • petrogenetic adj. (Geology) Of or pertaining to petrogenesis, the creation of new rock. • PETROGENETIC adj. relating to petrogenesis. |
| PETROGLYPHIC | • petroglyphic adj. Of or pertaining to petroglyphy. • PETROGLYPHIC adj. of or like a petroglyph, an ancient rock-carving. |
| PETROGRAPHER | • petrographer n. A person practicing petrography. • PETROGRAPHER n. a practitioner of petrography. |
| PETROGRAPHIC | • petrographic adj. Relating to petrographs. • petrographic adj. Relating to petrography. • PETROGRAPHIC adj. relating to petrography, also PETROGRAPHICAL. |
| PETROLOGICAL | • petrological adj. Of or pertaining to petrology, the study of rock formation and composition. • PETROLOGICAL adj. relating to petrology, also PETROLOGIC. |
| PETROLOGISTS | • petrologists n. Plural of petrologist. • PETROLOGIST n. a student of petrology, the geological study of rocks. |
| PETROPHYSICS | • petrophysics n. (Geology, physics) The physics of rock, especially rock that acts as a reservoir for petroleum or other fluids. • PETROPHYSICS n. that branch of physics relating to the physical properties of rocks. |