polyatomic

Of or relating to a molecule or ion that has two or more atoms as constituents.

In chem., noting elements or radicals which have an equivalency greater than two; also, noting compounds having three or more hydroxyl groups, in which hydrogen is easily replaceable by other elements or radieals without otherwise changing the structure of the original compound: thus, glycerol is a polyatomic alcohol.

Having more than one atom in the molecule; consisting of several atoms.

Having a valence greater than one.

(of a molecule or ion) consisting of three or more atoms

of or relating to a molecule made up of more than two atoms