*doctrinaire*

‖n. [ F. See Doctrine. ] One who would apply to political or other practical concerns the abstract doctrines or the theories of his own philosophical system; a propounder of a new set of opinions; a dogmatic theorist. Used also adjectively; as, doctrinaire notions. [ 1913 Webster ]

☞ In french history, the Doctrinaires were a constitutionalist party which originated after the restoration of the Bourbons, and represented the interests of liberalism and progress. After the Revolution of July, 1830, when they came into power, they assumed a conservative position in antagonism with the republicans and radicals. Am. Cyc. [ 1913 Webster ]