An alternate spelling of cerveliere, a lightweight medieval helmet designed to protect the skull and brain area.
The original French spelling cervelierre or cervellière, with the English variant cerveliere dropping one 'l'; both derive from French cervelle (brain), emphasizing the helmet's primary protective function.
The spelling 'cervelliere' with double-l is closer to the French original and appears in older English texts about medieval warfare—it's one of those foreign words where English hasn't quite decided which spelling is 'correct' yet.
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