from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An inorganic fibrous substance that is produced by steam blasting and cooling molten glass or a similar substance and is used as an insulator and a filtering material. Also called rock wool.
from the GNU version of the Collaborative International Dictionary of English
- adj. a fibrous wool-like material, made by blowing a powerful jet of air or steam through melted slag. It is a poor conductor of heat.
- n. See under Mineral.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a light fibrous material used as an insulator
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