sillimanite

noun
sil·​li·​man·​ite | \ ˈsi-lə-mə-ˌnīt How to pronounce sillimanite (audio) \

Definition of sillimanite

: a brown, grayish, or pale green mineral that consists of an aluminum silicate in orthorhombic crystals often occurring in fibrous or columnar forms

First Known Use of sillimanite

circa 1830, in the meaning defined above

History and Etymology for sillimanite

Benjamin Silliman †1864 American geologist

Keep scrolling for more

Learn More about sillimanite

Statistics for sillimanite

Time Traveler for sillimanite

The first known use of sillimanite was circa 1830

See more words from the same year

More from Merriam-Webster on sillimanite

Britannica.com: Encyclopedia article about sillimanite

Comments on sillimanite

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

WORD OF THE DAY

something of little or no value

Get Word of the Day daily email!

Test Your Vocabulary

Pass the Little Ribbons: A Pasta Word Quiz

  • rotelle pasta
  • Match the pasta to its meaning in English: Rotelle
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Syn City

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!