• synonyms


[od, ohd]
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  1. a hypothetical force formerly held to pervade all nature and to manifest itself in magnetism, mesmerism, chemical action, etc.
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Also odyl, odyle.

Origin of od

First recorded in 1840–50; arbitrary name coined by Karl von Reichenbach (1788–1869), German scientist


  1. on demand.
  2. outside diameter.
  3. outside dimensions.
  4. overdraft.
  5. overdrawn.
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or 'Od, Odd

interjection Archaic.
  1. a shortened form of “God” (used in euphemistically altered oaths).
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Origin of Od

First recorded in 1590–1600


noun, plural ODs or OD's.
  1. an overdose of a drug, especially a fatal one.
  2. a person who has taken an overdose of a drug, especially one who has become seriously ill or has died from such an overdose.
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verb (used without object), OD'd or ODed or OD'ed, OD'ing or OD·ing.
  1. to take an overdose of a drug.
  2. to die from an an overdose of a drug.
  3. to have or experience an excessive amount or degree of something.
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Origin of OD

First recorded in 1955–60


  1. officer of the day.
  2. Old Dutch.
  3. Ordnance Department.
  4. outside diameter.
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  1. Old Dutch.
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  1. (in prescriptions) the right eye.
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Origin of o.d.1

From the Latin word oculus dexter


  1. olive drab.
  2. on demand.
  3. outside diameter.
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  1. (in prescriptions) the right eye.
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Origin of O.D.1

From the Latin word oculus dexter


  1. Doctor of Optometry.
  2. officer of the day.
  3. Old Dutch.
  4. (of a military uniform) olive drab.
  5. ordinary seaman.
  6. outside diameter.
  7. overdraft.
  8. overdrawn.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for od

Historical Examples

  • To what land was he taken, that his life might be saved from King Hĕr´od?

    Hurlbut's Bible Lessons

    Rev. Jesse Lyman Hurlbut

  • Thomas brought bedding from the OD bunk and made me comfortable on the floor.


    John Keith Laumer

  • I was resting on the OD bunk, and Clay was standing beside me.


    John Keith Laumer

  • Examples of imitation (which is commonest in Book i.) are: Od.

  • Tibullus was on friendly terms with Horace, who addressed to him Od.

British Dictionary definitions for od


odyl or odyle (ˈɒdɪl)

  1. archaic a hypothetical force formerly thought to be responsible for many natural phenomena, such as magnetism, light, and hypnotism
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Derived Formsodic, adjective

Word Origin

C19: coined arbitrarily by Baron Karl von Reichenbach (1788–1869), German scientist


'Od or Odd

  1. euphemistic (used in mild oaths) an archaic word for God
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  1. an overdose of a drug
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verb OD's, OD'ing or OD'd
  1. (intr) to take an overdose of a drug
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Word Origin

C20: from o (ver) d (ose)


abbreviation for
  1. Officer of the Day
  2. Old Dutch
  3. ordnance datum
  4. outside diameter
  5. Also: o.d. military olive drab
  6. Also: O/D banking
    1. on demand
    2. overdraft
    3. overdrawn
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for od


abbreviation of overdose, attested from 1960.

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Online Etymology Dictionary, © 2010 Douglas Harper

od in Medicine


  1. Doctor of Optometry
  2. oculus dexter (right eye)
  3. overdose
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.