sillimanite

noun sil·li·man·ite \ˈsi-lə-mə-ˌnīt\

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

Benjamin Silliman †1864 American geologist

First Known Use: circa 1830

Next Word in the Dictionary: sillimanite groupPrevious Word in the Dictionary: sillibubAll Words Near: sillimanite

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

Put-downs with flair

How to use a word that (literally) drives some people nuts.

Test your vocab with our fun, fast game

Ailurophobia, and 9 other unusual fears