Science
- Optical Density (absorbance)
- Optical depth
- Optical depth (astrophysics)
- Oxygen Demand
- Biochemical oxygen demand
- Carbonaceous biochemical oxygen demand
- Chemical oxygen demand
- Theoretical oxygen demand
Read more about this topic: OD
Famous quotes containing the word science:
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—J.B.S. (John Burdon Sanderson)
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—George Eliot [Mary Ann (or Marian)