thermal Hear it!

thermal definition

ther·mal (t̸hʉr′məl)

adjective

  1. having to do with heat, hot springs, etc.
  2. warm or hot
  3. ☆ designating or of a loosely knitted material honeycombed with air spaces for insulation to help retain body heat thermal underwear

Etymology: Fr < Gr thermē, heat: see warm

noun

a rising column of warm air, caused by the uneven heating of the earth or sea by the sun

Related Forms:

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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