a strongly magnetic, black, semiconducting substance, CrO2, used as the active material in a type of recording tape.
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British Dictionary definitions for chromium dioxide
a chemical compound used as a magnetic coating on cassette tapes; chromium(IV) oxide. Formula: CrO 2Also called (not in technical usage): chrome dioxide
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