pyrimidinone in English dictionary pyrimidinone Meanings and definitions of "pyrimidinone" (organic chemistry) Any of several heterocyclic ketones derived from pyrimidine noun (organic chemistry) Any of several heterocyclic ketones derived from pyrimidine more Grammar and declension of pyrimidinone pyrimidinone ( plural pyrimidinones) more Sample sentences with "pyrimidinone" Declension Stem Try again Authors