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.
clear, colourlessform 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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