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noun pill·box \ˈpil-ˌbäks\

Simple Definition of pillbox

  • : a small box for holding pills

  • : a small, low shelter for machine guns and other weapons

  • : a small, round hat without a brim

Source: Merriam-Webster's Learner's Dictionary

Full Definition of pillbox

  1. 1 :  a box for pills; especially :  a shallow round box of pasteboard

  2. 2 :  a small low concrete emplacement for machine guns and antitank weapons

  3. 3 :  a small round hat without a brim; specifically :  a woman's shallow hat with a flat crown and straight sides

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