Definition of ion spot in English:

ion spot

noun

Chemistry Physics
  • 1A small area struck by a beam of ions.

  • 2A dark spot in the middle of the screen of a cathode ray tube where the phosphor is damaged as a result of ion burn.

  • 3A white spot in a television picture produced as a spurious signal when ionized gas molecules strike the target of a television camera tube.

Origin

1930s; earliest use found in The Physical Review.