dissolved oxygen

Main Entry:  dissolved oxygen
Part of Speech:  n
Definition:  the amount of oxygen dissolved in a body of water as an indication of the degree of health of the water and its ability to support a balanced aquatic ecosystem; also, the amount of free (not chemically combined) oxygen dissolved in water, wastewater, or other liquid, usually expressed in milligrams per liter, parts per million, or percent of saturation; abbr. DO
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