any oxide that contains three oxygen atoms per molecule
sulphur trioxide, SO3
trioxide in American English
(traɪˈɑksaɪd)
noun
an oxide having three oxygen atoms to the molecule
trioxide in American English
(traiˈɑksaid, -sɪd)
noun
Chemistry
an oxide containing three oxygen atoms, as As2O3
Word origin
[1865–70; tri- + oxide]This word is first recorded in the period 1865–70. Other words that entered Englishat around the same time include: batting average, figure skating, goulash, springboard, tick-tack-toetri- is a combining form meaning “three,” used in the formation of compound words. Otherwords that use the affix tri- include: triforium, trigeminal, trinomial, triple, trivial
Examples of 'trioxide' in a sentence
trioxide
Treatments used arsenic right up until the 1950s when tablets still contained one-eighth grain of arsenic trioxide.