Bolt″head′ (�), n. 1. (Chem.) A long, straight-necked, glass vessel for chemical distillations; — called also a matrass or receiver.
2. The head of a bolt.
Webster's Dictionary 1913
Bolt″head′ (�), n. 1. (Chem.) A long, straight-necked, glass vessel for chemical distillations; — called also a matrass or receiver.
2. The head of a bolt.