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From The Collaborative International Dictionary of English v.0.48:
Crosshead \Cross"head`\ (-h?d), n. (Mach.) 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. [1913 Webster]