One of the mysteries of the English language finally explained.
Pulverized rock, especially (in later use) as spread in coal mines in order to reduce the risk of coal-dust explosions.
with object To subject (a coal mine) to rock dusting.
Early 19th century; earliest use found in American Magazine. From rock + dust<br>early 20th century; earliest use found in Compressed Air Magazine. From rock + dust.
rock dust/ˈrɒk dʌst/
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