stoichiometric Syllabification: (stoi·chi·o·met·ric)Pronunciation: /ˌstoikē-ōˈmetrik/Definition of stoichiometric adjective Chemistry of or relating to stoichiometry. relating to or denoting quantities of reactants in simple integral ratios, as prescribed by an equation or formula. Derivatives stoichiometricallyPronunciation: /-ik(ə)lē/ adverb stoichiometric in other Oxford dictionaries Definition of stoichiometric in the British & World English dictionary