Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
of or pertaining to a hot and dry climatic period, as one of the postglacial periods
Origin: xero- plush thermic
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- Both dry and hot: a xerothermic climate.
- Adapted to or flourishing in an environment that is both dry and hot: xerothermic organisms.