Webster's Online Dictionary
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Definition: BOLTHEAD

Part of Speech Definition
Noun 1. A long, straight-necked, glass vessel for chemical distillations; -- called also a matrass or receiver.[Websters]
2. The head of a bolt.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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"Bolthead" is a common misspelling or typo for: bolted, bulkhead, bullhead, baldhead, bolt head.

Date "Bolthead" was first used in popular English literature: sometime before 1872. (references)

Definition: BOLTHEAD

Part of SpeechDefinition
Noun1. A long, straight-necked, glass vessel for chemical distillations; -- called also a matrass or receiver.[Websters]
2. The head of a bolt.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "BOLTHEAD" was first used in popular English literature: sometime before 1872. (references)