| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Putrefaction | No definition provided | Christopher Rauch | 2023.12.01 |
| Putzite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Puyallup Indians | No definition provided | Christopher Rauch | 2023.12.01 |
| Puzzles | No definition provided | Christopher Rauch | 2023.12.01 |
| p value | No definition provided | Ryan McGranaghan | 2023.04.16 |
| PV Telescopii variable stars | No definition provided | Ryan McGranaghan | 2023.04.16 |
| p wave | P waves are longitudinal or compressional waves, which means that the ground is alternately compressed and dilated in the direction of propagation. In solids these waves generally travel slightly less than twice as fast as S waves and can travel through any type of material. In air, these pressure waves take the form of sound waves, hence they travel at the speed of sound. Typical speeds are 330 m/s in air, 1450 m/s in water and about 5000 m/s in granite. P waves are sometimes called primary waves. When generated by an earthquake they are less destructive than the S waves and surface waves that follow them, due to their lesser amplitudes. | Ryan McGranaghan | 2023.04.16 |
| Pwo dialect | No definition provided | Christopher Rauch | 2023.12.01 |
| Pyaemia | No definition provided | Christopher Rauch | 2023.12.01 |
| Pyatenkoite (Y) | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Pycnite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| pycnocline | A pycnocline is a layer across which there is a rapid change in water density with depth. In freshwater environments such as lakes this density change is primarily caused by water temperature, while i n seawater environments such as oceans the density change may be caused by changes in water temperature and/or salinity | Ryan McGranaghan | 2023.04.16 |
| Pycnogonida | No definition provided | Christopher Rauch | 2023.12.01 |
| Pyemia | No definition provided | Christopher Rauch | 2023.12.01 |
| Pygmies | No definition provided | Christopher Rauch | 2023.12.01 |
| Pygopodes | No definition provided | Christopher Rauch | 2023.12.01 |
| Pyloric spasms | No definition provided | Christopher Rauch | 2023.12.01 |
| Pylorus | No definition provided | Christopher Rauch | 2023.12.01 |
| Pyocyanase | No definition provided | Christopher Rauch | 2023.12.01 |
| Pyorrhoea alveolaris | No definition provided | Christopher Rauch | 2023.12.01 |