noun
- A unit of pressure.
- synonyms: pounds per square inch
- The 23rd letter of the Greek alphabet. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). psi. Retrieved September 20, 2026, from http://smartdefine.org/psi/definitions/1217767 |
| Chicago | WordNet. 2010. "psi" http://smartdefine.org/psi/definitions/1217767 (accessed September 20, 2026). |
| Harvard | WordNet 2010, psi, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/psi/definitions/1217767>. |
| MLA | WordNet. "psi" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/psi/definitions/1217767> |