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
Sorry, no etymologies found.
Several hoses did reach through the air lock, but their inner ends entered tanks in which pseudolife forms precipitated carbon dioxide as calcium carbonate — they simply provided fertilizer for the oxygenmakers.