Diatomic refers to molecules composed of two atoms of the same or different element. Some synonyms for the word diatomic include bivalent, binuclear, and dimeric. Bivalent implies the presence of two atoms or groups in a molecule with a valence of two. Binuclear refers to a molecule with two nuclei, while dimeric implies the presence of two identical subunits. Other synonyms include dual, duplex, and twofold, which emphasize the idea of two components in a molecule or entity. Ultimately, these synonyms highlight the two-component nature inherent in diatomic molecules, providing alternative ways to describe the unique chemical properties and characteristics of these compounds.