glass wool

glass wool

noun
spun glass similar to wool, used for insulation, filters, etc.

Origin:
1875–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Glass wool is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
glass wool
 
n
fine spun glass massed into a wool-like bulk, used in insulation, filtering, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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