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

  • n. A shallow glass dish used as a beaker cover or evaporating surface.
  • n. A concavo-convex glass or plastic disk used to cover the face of a watch.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An item of glass laboratory equipment consisting of a simple slightly concave circle of glass. It is a general utility item, used to hold small samples, to evaporate liquids, to cover a beaker, and so on.

from the GNU version of the Collaborative International Dictionary of English

  • n. A half-hour glass used to measure the time of a watch on deck.

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

  • n. a protective cover that protects the face of a watch
  • n. laboratory glassware; a shallow glass dish used as an evaporating surface or to cover a beaker


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