'Bolthead' definitions:

Definition of 'Bolthead'

From: GCIDE
  • Bolthead \Bolt"head`\, n.
  • 1. (Chem.) A long, straight-necked, glass vessel for chemical distillations; -- called also a matrass or receiver. [1913 Webster]
  • 2. The head of a bolt. [1913 Webster]