O.D.
Noun

O.D. (uncountable)

  1. (US) Doctor of optometry, a postgraduate degree.
  2. (UK) Ordnance datum, a reference point used for measuring elevations or depths.
  3. Abbreviation of ordinary seaman#English|ordinary seaman.
  4. (eyewear) Initialism of oculus [[dexter]] the right eye from the patient's point of view
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