The fortified main tower of a castle; a keep.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "donjon" in a sentence
"It held meetings in our big vault, which they called the donjon keep, and, naturally, when one of them was going on, boys were scarcer around the office than hen's teeth."
"Although the donjon was a fundamental element of castle design from Norman times, Greenwich had no fortifications, no moat, and no visible sense of being a castle."
"After passing the donjon, which is situated at the extreme end of the left wing, we went to the back of the chateau."