rocker arm

noun

A valvetrain component that typically transfers the motion of a pushrod in an overhead valve internal combustion engine to the corresponding intake or exhaust valve.

Similar
valve rocker
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Meanings

nounrocker arm (plural rocker arms)

plural rocker arms

  1. engineeringA valvetrain component that typically transfers the motion of a pushrod in an overhead valve internal combustion engine to the corresponding intake or exhaust valve.

    All the rocker arms have an automatic hydraulic adjustment, which ensures at all times that no backlash is present in the valve motion.

    1958 September 29, “Swindon's First Main-Line Diesel Locomotive”, in Railway Magazine, page 601

Synonyms & antonyms

nouna lever pivoted at the center; used especially to push a valve down in an internal-combustion engine

Similar
valve rocker
Broader
lever

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

rocker arm. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/rocker%20arm

MLA

“rocker arm.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/rocker%20arm. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “rocker arm,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/rocker%20arm.

Source: rocker arm on Wiktionary, CC BY-SA 4.0.