triatomic

Containing three atoms.

In chem.: Consisting of three atoms: applied to the molecules of elements where the atoms are of the same kind: as, a triatomic element; or to compounds where the atoms are unlike: as, triatomic molecules.

Same as trivalent.

Having three hydroxyl groups by which other atoms or radicals may be attached without altering the structure of the rest of the molecule: thus, glycerin is called a triatomic alcohol.

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.

Consisting of three atoms.