didactic

a. (Zool.) Having only two digits; two-toed. [ 1913 Webster ]

n. A treatise on teaching or education. [ Obs. ] Milton. [ 1913 Webster ]

{ } a. [ Gr. &unr_;, fr. &unr_; to teach; akin to L. docere to teach: cf. F. didactique. See Docile. ] 1. Fitted or intended to teach; conveying instruction; preceptive; instructive; teaching some moral lesson; as, didactic essays. “Didactical writings.” Jer. Taylor. [ 1913 Webster ]

The finest didactic poem in any language. Macaulay. [ 1913 Webster ]

2. excessively prone to instruct, even those who do not wish to be instructed; -- of people. [ Pejorative ]
Syn. -- didactic. [ WordNet 1.5 ]

adv. In a didactic manner. [ 1913 Webster ]

n. The didactic method or system. [ 1913 Webster ]

n. Aptitude for teaching. Hare. [ 1913 Webster ]