glass wool

noun

Definition of glass wool

: glass fibers in a mass resembling wool and being used especially for thermal insulation and air filters

First Known Use of glass wool

1879, in the meaning defined above

Keep scrolling for more

Learn More about glass wool

Statistics for glass wool

Look-up Popularity

Time Traveler for glass wool

The first known use of glass wool was in 1879

See more words from the same year

More from Merriam-Webster on glass wool

Britannica.com: Encyclopedia article about glass wool

Comments on glass wool

What made you want to look up glass wool? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a usually brief trip or an expedition

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!