bolthead

[ bohlt-hed ]
/ ˈboʊltˌhɛd /

noun

the head of a bolt.
Chemistry. (formerly) a matrass.

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Origin of bolthead

late Middle English word dating back to 1425–75; see origin at bolt1, head
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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