Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. See booster shot.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A dose of an antigen designed to strengthen immunity after an earlier immunizing dose.

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

  • n. an additional dose that makes sure the first dose was effective

Etymologies

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