• synonyms


[proh-tok-sahyd, -sid]
noun Chemistry.
  1. the one of a series of oxides having the smallest proportion of oxygen.
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Also pro·tox·id [proh-tok-sid] /proʊˈtɒk sɪd/.

Origin of protoxide

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for protoxide

Historical Examples of protoxide

British Dictionary definitions for protoxide


  1. the oxide of an element that contains the smallest amount of oxygen of any of its oxides
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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