() From Medieval Latin prognosticus, from Ancient Greek προγνωστικός (prognostikos, “foreknowing”), from πρό- (pro-) + γνωστικός (gnostikos, “of or for knowing, good at knowing”), from γιγνώσκω (gignosko, “to learn to know, to perceive, to mark, to learn”).
Compare French pronostic (“prognostic”).