castle -
a large building formerly occupied by a ruler and fortified against attack
fortification,
munition the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)
donjon,
dungeon,
keep a dark cell (usually underground) where prisoners can be confined
castle -
To bowl a batsman with a full-length ball or yorker such that the stumps are knocked over.
Wikipedia
A castle is a type of fortified structure built in Europe and the Middle East during the Middle Ages. Scholars debate the scope of the word castle, but usually consider it to be the private fortified residence of a lord or noble. This is distinct from a fortress, which was not a home, and from a fortified town, which was a public defence, though there are many similarities between these types of construction.
OmegaWiki Dictionary
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castle Historical building or group of building used for defense by military forces, whose main structures are walls and towers.
castle A piece of chess commonly shaped like a tower. Each player has two, and they move in straight horizontal or vertical lines across the board.