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Definition of Hydropneumatic
1. a. Pertaining to, or depending upon, both liquid and gaseous substances; as, hydropneumatic apparatus for collecting gases over water or other liquids.
Definition of Hydropneumatic
1. Adjective. Operated by both fluid and air power ¹
2. Adjective. Being, or pertaining to, a type of automotive suspension system based on a nitrogen springing medium. ¹
¹ Source: wiktionary.com