Cite
 

Meaning of thermion

therm•i•on

Pronunciation: (thûrm'ī"un, -on thûr'mē&sylpun), [key]
— n. Physics.
  1. an ion emitted by incandescent material.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also: