Hy`dro*pneu*mat"ic\, a. [Hydro-, 1 + pneumatic: cf. F. hydropneumatique.] 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, © 1996, 1998 MICRA, Inc.
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