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Noun ionosphere has 1 sense
  1. ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons
    --1 is a kind of     region, part
    --1 is a part of atmosphere, air
    --1 has parts:
     D-layer, D region; Appleton layer, F layer, F region; Heaviside layer, Kennelly-Heaviside layer, E layer, E region
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