Definition of castle
(Entry 1 of 2)
1a
: a large fortified building or set of buildings
b
: a massive or imposing house
2
: a retreat safe against intrusion or invasion
3
: rook entry 3
castle
verbDefinition of castle (Entry 2 of 2)
: to move a chess king two squares toward a rook and in the same move the rook to the square next past the king
Test Your Vocabulary
Eponyms: Words Named After People
-
- What is the best definition of boycott?

Test your knowledge - and maybe learn something along the way.
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share castle
Time Traveler for castle
The first known use of castle was before the 12th century
See more words from the same century