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

  • noun Colorless transparent quartz, used in optical instruments and as a semiprecious gemstone.

from The Century Dictionary.

  • noun See crystal, and cut under pokal.

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

  • noun clear, colourless form of the silica-based mineral quartz, often called "pure quartz" or "clear quartz".

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

  • noun a clear quartz used in making electronic and optical equipment


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