ionosphere

• POS: Noun
• HYPHEN: i=on=o=sphere

CIDE DICTIONARY

ionosphere, n. 

 the outer region of the earth's atmosphere, beyond which is the exosphere; it contains a high concentration of free electrons and ions, and extends from about 50 miles to about 250 miles above the earth's surface, but the height shows daily and seasonal variation, and the composition of the particles in the ionosphere is also affected by events such as solar flares.  [WordNet 1.5]

OXFORD DICTIONARY

ionosphere, n. an ionized region of the atmosphere above the stratosphere, extending to about 1,000 km above the earth's surface and able to reflect radio waves for long-distance transmission round the earth (cf. TROPOSPHERE).

Derivative

ionospheric adj.

THESAURUS

ionosphere

Appleton layer, CAT, F layer, Heaviside-Kennelly layer, Van Allen belt, aerospace, aerosphere, air hole, air pocket, airspace, belt, bump, ceiling, chemosphere, crosswind, empty space, favorable wind, fog, front, head wind, high-pressure area, hole, isothermal region, jetstream, layer, low-pressure area, lower atmosphere, outer atmosphere, overcast, photosphere, pocket, roughness, soup, space, stratosphere, stratum, substratosphere, tail wind, tropopause, troposphere, trough, turbulence, upper atmosphere, visibility, visibility zero