( a. )
Pertaining to, or depending upon, both liquid and gaseous substances; as, hydropneumatic apparatus for collecting gases over water or other liquids.
( 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 English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012