noun Petrology.

schist colored green by an abundance of chlorite, epidote, or actinolite.

Nearby words

  1. greens fee,
  2. greensand,
  3. greensand process,
  4. greensboro,
  5. greensburg,
  6. greenshank,
  7. greensickness,
  8. greenskeeper,
  9. greensome,
  10. greenspan

Compare greenstone.

Origin of greenschist Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science definitions for greenschist



A green, schistose metamorphic rock that gets its color from the presence of chlorite, epidote, or actinolite. Greenschist forms under conditions of low temperature and low pressure.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.