bolthead

[bohlt-hed]

bolt·head

[bohlt-hed]
noun
1.
the head of a bolt.
2.
Chemistry. (formerly) a matrass.

Origin:
1425–75; late Middle English; see bolt1, head
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Bolthead is always a great word to know.
So is formaldehyde. Does it mean:
a colorless, toxic, water-soluble gas having a suffocating odor, used chiefly as a disinfectant and preservative, contained in resins and plastics
to heat intensely or roast
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