| Term | Definition |
| petroleum | crude oil that occurs naturally in sedimentary rocks and consists mainly of hydrocarbons |
| petroglyph | ancient carving or inscription on rock |
| petrology | the study of the origin, formation, and composition of rocks |
| petrographic | related to the systematic description and classification of rocks using microscopic examination |
| petrify | to turn organic matter into stone |
| petroliferous | containing or yielding petroleum |
| pensive | thoughtfully weighing an issue or problem |
| suspension | an interruption, literally "to be left hanging" |
| pendant | an ornamental hanging object |
| impending | that which is about to occur |
| pendulous | hanging loosely or swinging freely |
| appendage | a projecting body part, a secondary attachment |
| append | to attach; state further |