(a.) Pertaining to or depending upon, both liquid and gaseous substances; as, hydropneumatic apparatus for collecting gases over water or other liquids.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). hydropneumatic. Retrieved September 23, 2026, from http://smartdefine.org/hydropneumatic/definitions/2018119 |
| Chicago | Webster's. 2011. "hydropneumatic" http://smartdefine.org/hydropneumatic/definitions/2018119 (accessed September 23, 2026). |
| Harvard | Webster's 2011, hydropneumatic, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/hydropneumatic/definitions/2018119>. |
| MLA | Webster's. "hydropneumatic" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/hydropneumatic/definitions/2018119> |