meaning of crosshead
1. 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.
2. metal block that connects to a piston; it slides on parallel guides and moves a connecting rod back and forth
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