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A didactic person.

[Back-formation from didactic.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Education) a person who is didactic
2. (Literary & Literary Critical Terms) a person who produces didactic literature or other work
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈdaɪ dækt)

a didactic person.
[1950–55; probably back formation from didactic; compare autodidact]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
While Cole's implications are unarguably problematic, Handler's no didact." HAYDEN BENNETT
According to (http://gamingbolt.com/halo-5-guardians-comic-reveals-how-master-chiefs-helmet-got-cracked) Gamingbolt , the reason for the crack is Master Chief's face-off with the Didact.
In Pavsek's account, Godard's deep-seated cultural pessimism functions as a "stand-in of sorts for Adorno," while Tahimik's work appears as that of a "Brechtian didact." In good dialectical fashion, Kluge's output, then appears as an "attempt to reconcile these two divergent impulses by combining Brecht's revolutionary didacticism with Adorno's skepticism" (17), and the chapter on Kluge is correspondingly the richest and most convincing section of Pavsek's book.
The Crop Protection department (CPD) has reported no major disease in mango clusters except some common diseases such as powdery mildew, emflorance, and didact which are controlled through proper insect sprays.
One can perceive, as well, another skill in the background--the declarative voice of a natural didact and patriarch.
Hue, Denis, ed., Lectures de Charles d'Orleans: Les Ballades (Didact Francais), Rennes, Presses Universitaires de Rennes, 2010; paperback; pp.
Shaw's reputation as a social reformer and didact made him a natural target for Huxley, and the details of the scene are drawn from a web of associations linking Shaw to cinema history.
With no contents page, the reader steps right into "Grease," a five-line poem that closes: "When the starter falls it is heavy, I should prepare but I never quite/can, it thumps my chest like a sneeze." The "auto" (didact) in "Auto Repair" presents an extended metaphor for the speaker's efforts to fix a failing marriage.