retarder.
Something which retards or slows.
Meaning & usage
Something which retards or slows.
The substance acted as a retarder to the chemical reaction because it radically changed the pH.
A device for slowing down large trucks, lorries, buses, shunted railway wagons.
A refrigerator used to slow down proofing of yeast when making dough.
Where this word comes from
Etymology tree Proto-Italic *wre- Latin re- Proto-Indo-European *tr̥h₂-d-o- Proto-Italic *tardo- Latin tardus Latin retardōbor. Anglo-Norman retarderbor. Middle English retarden English retard English -er English retarder From retard + -er.
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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.