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platinum black

noun, Chemistry
1.
a black powder consisting of very finely divided metallic platinum, used as a catalyst, especially in organic synthesis.
Origin
1850-1855
1850-55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for platinum-black

platinum black

noun
1.
(chem) a black powder consisting of very finely divided platinum metal. It is used as a catalyst, esp in hydrogenation reactions
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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12
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