didactic

Etymology

From French didactique, from Ancient Greek διδακτικός (didaktikós, “skilled in teaching”), from διδακτός (didaktós, “taught, learnt”), from διδάσκω (didáskō, “I teach, educate”).

adj

1. Instructive or intended to teach or demonstrate, especially with regard to morality.
   didactic poetry
2. Excessively moralizing.
3. (medicine) Teaching from textbooks rather than laboratory demonstration and clinical application.

noun

1. (archaic) A treatise on teaching or education.