Dedoceo, dédoces, penult. corr. dedócui, dedoctum, dedocêre. Quint. To teache otherwise than he was taught before: to shewe that it is false that he learned before.
Lewis and Short: Latin dictionary
dē-dŏcĕo, ēre, v. a., to cause one to unlearn something, to unteach, teach the opposite of (rare, but class.). (a). With double acc.: aliquem geometriam, Cic. Fin. 1, 6, 20: regnorum gaudia temet, Stat. Th. 2, 409.— (b). With acc. pers. and inf.: (virtus) populum falsis Dedocet uti Vocibus, Hor. Od. 2, 2, 20.—(g).Pass.: cum aut docendus is est aut dedocendus, Cic. de Or. 2, 17, 72: cum a Zenone fortis esse didicisset, a dolore dedoctus est, id. Tusc. 2, 25, 60. In the gerund absol.: onus dedocendi gravius quam docendi, Quint. 2, 3, 2: ut coercendi magis quam dedocendi esse videantur, id. Fin. 1, 16, 51.