Definitions

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

  • abbreviation oral poliovirus vaccine

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

  • noun military, aviation, US optionally piloted vehicle;

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun an oral vaccine (containing live but weakened poliovirus) that is given to provide immunity to poliomyelitis

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Initialism of optionally piloted vehicle.

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