radiation

noun
ra*di*a*tion \ ˌrā-dē-ˈā-shən \
15th century{ds||1|a|}
  • the action or process of radiating
  • the process of emitting radiant energy in the form of waves or particles
  • the combined processes of emission, transmission, and absorption of radiant energy

radiation sickness

noun
radiation sickness \
1924
  • sickness that results from exposure to radiation and is commonly marked by fatigue, nausea, vomiting, loss of teeth and hair, and in more severe cases by damage to blood-forming tissue with decrease in red and white blood cells and with bleeding

radiation therapy

noun
radiation therapy \
1922
  • radiotherapy

adaptive radiation

noun
adaptive radiation \
1898
  • evolutionary diversification of a generalized ancestral form with production of a number of adaptively specialized forms

anti-radiation

adjective
an*ti-ra*di*a*tion \ ˌan-tī-ˌrā-dē-ˈā-shən \ ˌan-tē- \
1925{ds||1||}
  • designed to destroy radar or other sources of radio transmissions
  • counteracting the harmful effects of radiation on the body

background radiation

noun
background radiation \
1968
  • the microwave radiation pervading the universe that exhibits a corresponding blackbody temperature of 2.7 K and that is the principal evidence supporting the big bang theory —called also cosmic background radiation

Cerenkov radiation

noun
Ce*ren*kov radiation \ chə-ˈreŋ-kȯf- \ chər-ˈyeŋ- \
1938
  • light produced by charged particles (such as electrons) traversing a transparent medium at a speed greater than that of light in the same medium —called also Cerenkov light

cosmic background radiation

noun
cosmic background radiation \
circa 1976
  • background radiation

electromagnetic radiation

noun
electromagnetic radiation \
1891
  • energy in the form of electromagnetic waves; also : a series of electromagnetic waves

gamma radiation

noun
gamma radiation \
1904
  • radiation composed of gamma rays
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