from The American Heritage® Dictionary of the English Language, 5th Edition.

  • abbreviation Latin per os (by mouth)
  • abbreviation personnel officer
  • abbreviation petty officer
  • abbreviation postal order
  • abbreviation post office
  • abbreviation putout

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • initialism Post office
  • initialism law enforcement Police Officer
  • initialism law enforcement Probation officer
  • initialism business Purchase order
  • initialism pharmacology By mouth


Sorry, no etymologies found.



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