/ Dictionary / Index T tetroxide: Meaning and Definition of Find definitions for: te•trox•ide Pronunciation: (te-trok'sīd, -sid), [key] — n. Chem. an oxide whose molecule contains four atoms of oxygen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tetroxide (Thesaurus) tetrodotoxin tetryl Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language