from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A fine black powder of metallic platinum, used as a catalyst and as a gas absorbent.
from the GNU version of the Collaborative International Dictionary of English
- n. a soft, dull black powder, consisting of finely divided metallic platinum obtained by reduction and precipitation from its solutions. It absorbs oxygen to a high degree, and is employed as an oxidizer.
from The Century Dictionary and Cyclopedia
- n. A black dull powder consisting of very finely divided metallic platinum.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a fine black powder of platinum; used as a catalyst in chemical reactions
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