anorthosite

noun an·or·tho·site \ə-ˈnȯr-thə-ˌsīt\

Definition of ANORTHOSITE

: a granular plutonic igneous rock composed almost exclusively of a soda-lime feldspar (as labradorite)

— an·or·tho·si·tic \ə-ˌnȯr-thə-ˈsi-tik\ adjective

French anorthose, a feldspar, from a- + Greek orthos — more at orth-

First Known Use: 1863

Next Word in the Dictionary: AnosiaPrevious Word in the Dictionary: anorthoseAll Words Near: anorthosite

What made you want to look up anorthosite? 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