flywheel.
A rotating mass used to maintain the speed of a machine within certain limits while the machine receives or releases energy at a varying rate, or as a form of energy storage.
Meaning & usage
A rotating mass used to maintain the speed of a machine within certain limits while the machine receives or releases energy at a varying rate, or as a form of energy storage.
Where this word comes from
Etymology tree Proto-Indo-European *plew- Proto-Indo-European *plewk- Proto-Indo-European *-eti Proto-Indo-European *pléwketi Proto-Germanic *fleuganą Proto-West Germanic *fleugan Old English flēogan Middle English fliender. English fly Proto-Indo-European *kʷelh₁-redup. Proto-Indo-European *-os Proto-Indo-European *kʷekʷléh₂ Proto-Germanic *hweulō Old English hwēol Middle English whel English wheel English flywheel From fly + wheel.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.