rock wool

American  

noun

1. mineral wool.

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rock wool British  

noun

1. another name for mineral wool

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Etymology

Origin of rock wool

First recorded in 1925–30

Example Sentences

He has spent £4,000 on reports that suggest a mix of rock wool and polystyrene insulation - and a botched removal - have caused persistent damp.

From BBC

Plants are grown in containers filled with an organic hydroponic growing medium called rock wool.

From Washington Times

Originally planted in coconut fiber, which proved too acidic over time, it was replanted in inert rock wool with fresh plants.

From Washington Post

But the season can last year-round with indoor hydroponics, which uses water and nutrients to grow vertically stacked plants rooted in a binding material such as rock wool.

From Washington Times

Framed snugly between rock wool insulation and a comprehensive row of dumbbells, the blue pinups take the shape of the state of Maryland and reflect the current state of Good Counsel wrestling.

From Washington Post