The Collaborative International Dictionary
Triatomic \Tri`a*tom"ic\, a. [Pref. tri- + atomic.] (Chem.)
Having three atoms; -- said of certain elements or radicals.
Having a valence of three; trivalent; sometimes, in a specific sense, having three hydroxyl groups, whether acid or basic; thus, glycerin, glyceric acid, and tartronic acid are each triatomic.
Wiktionary
a. (context chemistry of a molecule etc. English) Consisting of three atoms.
Usage examples of "triatomic".
According to project directors Bradley McAfee and Lynn Saunders, nonutilizable hydrocarbonaceous substances will be propulsively transferred to stratospheric altitudinal locations, where photochemical decomposition will result in triatomic allotropism and formation of benign bicarbonaceous precipitates.
It had been ages since such lavish waste had been possible on Mars, whose thin air had contained but a small quantity of oxygen in its triatomic form, ozone, even when Earth was young.
The canopy, the new lowering copper-colored sky, shut out the direct sun and the remembered blue sky, and it shut out other things that had formerly trickled down: hard radiation, excessive ultraviolet rays and all the actinic rays, and triatomic oxygen.
And it should be beyond the power of hard radiation of every sort, beyond the fury of excessive ultraviolet rays or actinic rays or triatomic oxygen.