• synonyms


[plat-n-uh s]
adjective Chemistry.
  1. containing bivalent platinum.
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Origin of platinous

First recorded in 1835–45; platin(um) + -ous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for platinous

Historical Examples

  • A black powder, soluble in excess of alkali, and freely so in the acids, forming brown solutions of the platinous salts.

    Cooley's Practical Receipts, Volume II

    Arnold Cooley

  • Platinous oxalate, in fine copper-coloured needles, may be obtained by heating platinic oxide in a solution of oxalic acid.

British Dictionary definitions for platinous


  1. of or containing platinum, esp in the divalent state
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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