Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of bolthead is as below...

Bolthead :: Bolthead (n.) The head of a bolt.

Bolthead :: Bolthead (n.) A long, straight-necked, glass vessel for chemical distillations; -- called also a matrass or receiver..

Matrass :: Matrass (n.) A round-bottomed glass flask having a long neck; a bolthead.

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