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Castile

medieval Spanish county and later kingdom, from Vulgar Latin *castilla, from Latin castella, plural of castellum "castle, fort, citadel, stronghold" (see castle (n.)); so called in reference to the many fortified places there during the Moorish wars. The name in Spanish is said to date back to c.800. Related: Castilian. As a fine kind of soap, in English from 1610s.

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Definitions of Castile from WordNet

Castile (n.)
a region of central Spain; a former kingdom that comprised most of modern Spain and united with Aragon to form Spain in 1479;
Synonyms: Castilla
From wordnet.princeton.edu