18th cent. Borrowed from Ancient Greek διδακτικός (didaktikós) "skilled in teaching," from διδακτός (didaktós) "learned." From the verb δῐδᾰ́σκειν (didaskein) "to teach," which was a causative reduplication of δαῆναι (daênai) "to learn."
From Proto-Indo-European *dens- 'id.'
Galician didáctico, French didactique
Sanskrit dasrá- "effecting miracles"