from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The amount of oxygen required by aerobic microorganisms to decompose the organic matter in a sample of water, such as that polluted by sewage. It is used as a measure of the degree of water pollution. Also called biological oxygen demand.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The amount of oxygen needed by aerobic microorganisms to decompose all the organic matter in a sample of water; it is used as a measure of pollution.
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