bolthead

Meanings

1. 1
   noun

   the enlarged head of a bolt, shaped to be turned or to hold the bolt in place

   The mechanic placed the wrench firmly around the bolthead.

2. 2
   noun

   historical chemistry: a round-bottomed glass flask with a long neck; a matrass

   The chemist heated the solution gently in a glass bolthead.

A compound of bolt + head. The mechanical sense is transparent; the historical laboratory sense named a long-necked flask whose rounded body suggested a bolt head.

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