I. Act., to drive mad, to craze, deprive of mind: “dementatus,” Cassiod. Amic. 21: ἐξιστάναι ἰδιωτικῶς, Gloss. Graec. Lat.; esp. to bewitch, delude: “propter quod magiis suis dementasset eos,” Vulg. Act. 8, 11.—
II. Neut., to rave, be out of one's mind: “semper dementabat,” Lact. Mort. Pers. 7, 9.