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[proh-tok-sahyd, -sid]
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noun Chemistry.
  1. the one of a series of oxides having the smallest proportion of oxygen.
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

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British Dictionary definitions for protoxide


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