/ ˈsɪndə(r); NAmE / noun
[ usually pl. ] a small piece of ash or partly burnt coal, wood, etc. that is no longer burning but may still be hot :
a cinder track (= a track for runners made with finely crushed cinders )
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IDIOMS
see burn verb
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WORD ORIGIN
Old English sinder slag , of Germanic origin; related to German Sinter . The similar but unconnected French cendre (from Latin cinis ashes) has influenced both the sense development and the spelling.