: D region definition, thesaurus, dictionary , legal,encyclopedia, term explanation, information
- D region
n : the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
Synonyms | Related Words | Antonyms
region : a part of an animal that has a special function or is supplied by a given artery or nerve; "in the abdominal region"
region : a large indefinite location on the surface of the Earth; "penguins inhabit the polar regions"
region : the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"
E region : a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
F region : the highest region of the ionosphere (from 90 to 600 miles up) that contains the highest concentration of free electrons and is most useful for long-range radio transmission
region : the approximate amount of something (usually used prepositionally as in `in the region of''); "it was going to take in the region of two or three months to finish the job"; "the price is in the neighborhood of $100"
region : a knowledge domain that you are interested in or are communicating about; "it was a limited domain of discourse"; "here we enter the region of opinion"; "the realm of the occult"
red region : a place of eternal fire envisaged as punishment for the damned
nether region : (Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment; "Hurl''d headlong...To bottomless perdition, there to dwell"- John Milton; "a demon from the depths of the pit"
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