Basic Guidelines For English Spellings
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The hollow stem of a grass or cereal plant, especially that bearing the flower.
Mid 17th century from Latin culmus ‘stalk’.
1Geology
A series of Carboniferous strata in south-western England, mainly shale and limestone with some thin coal seams.
2
Middle English (in the sense ‘soot, smut’, now only Scots): probably related to coal.