trioxide

[trahy-ok-sahyd, -sid]

tri·ox·ide

[trahy-ok-sahyd, -sid]
noun Chemistry.
an oxide containing three oxygen atoms, as As2O3.

Origin:
1865–70; tri- + oxide
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Trioxide is always a great word to know.
So is combustion. Does it mean:
a salt of hydrofluoric acid consisting of fluorine, as sodium fluoride, NaF, or a compound containing fluorine, as methyl fluoride, CH3F
rapid oxidation accompanied by heat and light, or a chemical combination attended by production of heat and light
Collins
World English Dictionary
trioxide (traɪˈɒksaɪd)
 
n
any oxide that contains three oxygen atoms per molecule: sulphur trioxide, SO3

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

trioxide tri·ox·ide (trī-ŏk'sīd') or tri·ox·id (-ŏk'sĭd)
n.
An oxide containing three oxygen atoms per molecule.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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