[ fel-sik ]
/ ˈfɛl sɪk /

adjective Geology.

(of rocks) consisting chiefly of feldspars, feldspathoids, quartz, and other light-colored minerals.

Nearby words

  1. felonious,
  2. feloniously,
  3. felonry,
  4. felony,
  5. felony murder,
  6. felsite,
  7. felsitic,
  8. felspar,
  9. felspathic,
  10. felt

Compare mafic.

Origin of felsic

First recorded in 1910–15; fel(dspar) + s(ilica) + -ic

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for felsic



1912, from feldspar + silica + -ic.

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for felsic


[ fĕlsĭk ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.