trioxide

[trahy-ok-sahyd, -sid]
noun Chemistry.
an oxide containing three oxygen atoms, as As 2 O 3 .

Origin:
1865–70; tri- + oxide

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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
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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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Example sentences
Toxic fumes of arsenic trioxide and arsine may be formed in fire situations.
Determine the pharmacokinetics of arsenic trioxide with and without tretinoin in these patients.
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