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


Sorry, no etymologies found.


Sorry, no example sentences found.

Wordnik is becoming a not-for-profit! Read our announcement here.


Log in or sign up to get involved in the conversation. It's quick and easy.