Definition:
Didactic - intended to instruct.


Example:
"In prehistoric times the opening into China provided by the Huang He River (often called the Yellow River) furnished the most likely means of entry to the first settlers from Inner Mongolia. Although signs of early cultivation mark the banks of the two other major rivers of China, the Xi and the Yangtze, the first historically ascertainable political organization, the Xia dynasty, emerged about 2000 B.C. in the valley formed by the Huang He."
-The Humanities by Mary Witt


Explanation:
The most boring and dry language is used in text such as this. One can find it in almost any textbook a student has ever had the displeasure of carrying on his back.