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What does OD mean?

Looking for the meaning or definition of the word OD? Here's what it means.

Noun
  1. Abbreviation of overdose.
  2. (professional degree) Doctor of Optometry
  3. Abbreviation of overdrive.
  4. Abbreviation of overdraft.
  5. Initialism of optical density.
  6. (of a pipe or tube) Initialism of outer diameter.
  7. (Australia, on road signs) Initialism of over dimension, used on route numbers for large vehicles, and normally followed by a numeral, eg. OD5.
  8. (management) Initialism of Organization development.
Verb
  1. (informal) To take an overdose of a drug, to overdose.
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