Producing or generating coal slack or slack coal; formed from culm deposits.
From culm (coal dust or slack) + -genous (producing, from Latin generare 'to produce'). The term emerged in 19th-century mining terminology to describe geological processes that create coal byproducts.
This word captures how coal mining left its fingerprints on the English language—miners needed specific terms for every type of waste and deposit, so they invented technical words like this that reveal how humans categorize industrial byproducts.
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