Plural of crenel; the open notches or gaps that form part of a crenelation on castle walls or fortifications.
Simple plural of 'crenel' from Old French 'crenel,' derived from Latin 'crena.' Standard English pluralization by adding '-s' to the singular noun.
A castle's crenels were basically medieval weapons strategy turned into architecture—each gap was a calculated firing position where defenders could rain arrows on attackers!
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