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rock wool

rock wool

noun

  1. another name for mineral wool
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of rock wool1

First recorded in 1925–30
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Example Sentences

I found I have to plant in the spring and always in a tin can, with rock wool over the nut.

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