from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A fine black powder of metallic platinum, used as a catalyst and as a gas absorbent.
from The Century Dictionary.
- noun A black dull powder consisting of very finely divided metallic platinum.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a fine black powder of platinum; used as a catalyst in chemical reactions
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