Definition of rock dust in English:

rock dust

noun ˈrɒk dʌst

North American Mining

Pulverized rock, especially (in later use) as spread in coal mines in order to reduce the risk of coal-dust explosions.

verb ˈrɒk dʌst

North American Mining

with object To subject (a coal mine) to rock dusting.

Origin

Early 19th century; earliest use found in American Magazine. From rock + dust
early 20th century; earliest use found in Compressed Air Magazine. From rock + dust.

Definition of rock dust in US English:

rock dust

nounˈrɒk dʌst

North American Mining

Pulverized rock, especially (in later use) as spread in coal mines in order to reduce the risk of coal-dust explosions.

verbˈrɒk dʌst

North American Mining

with object To subject (a coal mine) to rock dusting.

Origin

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.

词汇	rock dust
释义	Definition of rock dust in English: rock dust noun ˈrɒk dʌst North American Mining Pulverized rock, especially (in later use) as spread in coal mines in order to reduce the risk of coal-dust explosions. verb ˈrɒk dʌst North American Mining with object To subject (a coal mine) to rock dusting. Origin Early 19th century; earliest use found in American Magazine. From rock + dust early 20th century; earliest use found in Compressed Air Magazine. From rock + dust. Definition of rock dust in US English: rock dust nounˈrɒk dʌst North American Mining Pulverized rock, especially (in later use) as spread in coal mines in order to reduce the risk of coal-dust explosions. verbˈrɒk dʌst North American Mining with object To subject (a coal mine) to rock dusting. Origin 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.
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