Submit your word to be a Word of the Day!


[fel-sik] /ˈfɛl sɪk/
adjective, Geology
(of rocks) consisting chiefly of feldspars, feldspathoids, quartz, and other light-colored minerals.
Compare mafic.
1910-15; fel(dspar) + s(ilica) + -ic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Examples from the web for felsic
  • The interior of a flow cools slower, so the light-colored felsic minerals are also able to crystallize.
  • The chemical composition of igneous rock can be broken into four main types: felsic, intermediate, mafic and ultramafic.
Word Origin and History for felsic

1912, from feldspar + silica + -ic.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
felsic in Science
Relating to an igneous rock that contains a group of light-colored silicate minerals, including feldspar, feldspathoid, quartz, and muscovite. Compare mafic.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for felsic

Some English speakers likely know this word

Word Value for felsic

Scrabble Words With Friends

Nearby words for felsic