from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A colorless or white crystalline compound, CaCO3, occurring naturally as chalk, limestone, marble, and other forms and used in a wide variety of manufactured products including commercial chalk, medicines, and dentifrices.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A colourless or white inorganic compound, CaCO3, occurring as chalk, limestone, marble etc; reacts with acids to liberate carbon dioxide.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a salt found in nature as chalk or calcite or aragonite or limestone
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