Definition of "didactic"

didactic

/daɪˈdæk.tɪk/

adjective
comparative more didactic, superlative most didactic
1. Instructive or intended to teach or demonstrate, especially with regard to morality.
  Quotations
  Falling Bastilles, Insurrections of Women, thousands of smoking Manorhouses, a country bristling with no crop but that of Sansculottic steel: these were tolerably didactic lessons; but them [the Nobility] they have not taught.
  1837, Thomas Carlyle, The French Revolution: A History […], volumes (please specify |volume=I to III), London: Chapman and Hall, (please specify the book or page number)
  The finest didactic poem in any language.
  1856 February, [Thomas Babington] Macaulay, “Oliver Goldsmith ”, in T[homas] F[lower] E[llis], editor, The Miscellaneous Writings and Speeches of Lord Macaulay, new edition, London: Longman, Green, Reader, & Dyer, published 1871
2. Excessively moralizing.
3. (medicine) Teaching from textbooks rather than laboratory demonstration and clinical application.
noun
plural didactics
1. (archaic) A treatise on teaching or education.