What does crosshead mean?
A crosshead is a specialized component found at the junction of a piston rod and a connecting rod in reciprocating machinery such as steam engines, marine diesel engines, pumps, and compressors. Typically a sliding block moving between guide surfaces, it serves two purposes: it prevents side thrust from being transmitted to the piston, allowing the piston rod to move in a straight line, and it provides a firm point of attachment for the connecting rod. Crossheads are critical wearing parts, so their bearings, pins, and lubrication receive close attention in engine maintenance. Separately, in printing and publishing, a crosshead is a heading set across the full measure of a column or page, used to break up long stretches of body text. Both uses are firmly technical; readers will most often encounter the mechanical sense in engineering documentation and the typographic sense in discussions of page design and newspaper layout.
A sliding block or crosspiece connecting a piston rod to a connecting rod in an engine or pump, guiding reciprocating motion and absorbing side thrust.
"Worn crosshead shoes were replaced during the ship's scheduled dry-docking."
A heading set across the full width of a column or page in printed matter.
"A bold crosshead divided the feature article into three readable sections."
The plural follows the standard pattern for countable nouns; it applies equally to the mechanical components and to the typographic headings.
"The overhaul required machining new bushings for all four crossheads."
The same word names both a hard-working steel block inside giant marine diesel engines and a typographer's trick for breaking up columns of text — two worlds, one word.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of crosshead
Crosshead is a straightforward English compound formed from 'cross' and 'head', with 'cross' deriving from Old Norse 'kross', borrowed ultimately from Latin 'crux'. The compound arose during the Industrial Revolution, when engineers needed a name for the cross-shaped fitting linking piston rod and connecting rod in early steam engines. The printing sense developed later by analogy, describing a heading laid across the page like a physical crosspiece.
How crosshead is actually used
Both senses are technical terms rather than everyday vocabulary. The engineering sense dominates modern usage, appearing chiefly in contexts involving steam engines, marine diesel engines, pumps, and compressors. The printing sense is now less frequent but still current in newspaper, magazine, and book production. Neither sense carries figurative or informal use.
Easily confused with crosshead
A header is a line of text repeated at the top of each page, whereas a crosshead is a heading running across the width of a single column or page within the text.