crosshead

noun

1. a heading of a subsection printed within the body of the text

   noun.communication

   Synonyms crossheading

   Source: WordNet 3.0

2. metal block that connects to a piston; it slides on parallel guides and moves a connecting rod back and forth

   noun.artifact

   Source: WordNet 3.0

3. A beam or bar across the head or end of a rod, etc., or a block attached to it and carrying a knuckle pin; as the solid crosspiece running between parallel slides, which receives motion from the piston of a steam engine and imparts it to the connecting rod, which is hinged to the crosshead.

   noun

   Source: webster1913