thermion Hear it!

thermion definition

therm·ion (t̸hʉr′mī′ən, t̸hʉr′mē-)

noun

Physics a negative or positive ion emitted by an incandescent material

Etymology: therm(o)- + ion

Related Forms:

  • thermionic therm′·ion′·ic (-än′ik) adjective

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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