English Etymology From di- + boride. Noun diboride (plural diborides) (inorganic chemistry) Any boride containing two atoms of boron Derived terms hafnium diboridemagnesium diboriderhenium diboridetitanium diboridezirconium diboride Translations any binary compound of boron and a more electropositive element Czech: diborid Wikiwand - on Seamless Wikipedia browsing. On steroids.