radiation
noun
ra·di·a·tion
| \ ˌrā-dē-ˈā-shən
\
\
Definition of radiation
1a
: the action or process of radiating
b
: the process of emitting radiant energy in the form of waves or particles
c(1)
: the combined processes of emission, transmission, and absorption of radiant energy
(2)
: the transfer of heat by radiation — compare conduction, convection
2a
: something that is radiated
b
: energy radiated in the form of waves or particles
3
: radial arrangement
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Other Words from radiation
radiational
\ ˌrā-dē-ˈā-shnəl
, -shə-nᵊl \
adjective
, -shə-nᵊl \
adjective
radiationless
\ ˌrā-dē-ˈā-shən-ləs
\
adjective
\
adjective
radiative
\ ˈrā-dē-ˌā-tiv
\
adjective
\
adjective
Examples of radiation in a Sentence
She was exposed to high levels of radiation.
He goes in for radiation next week.
the sun's radiation of heat
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Recent Examples on the Web
Treatment for pancreatic cancer also varies, but includes radiation, chemotherapy, surgery, immunotherapy, and, in late stages, pain control, per the ACS. — Christina Oehler, Health.com, "Ruth Bader Ginsburg Was Just Treated for A Malignant Tumor on Her Pancreas, Says Supreme Court," 23 Aug. 2019 She became known chiefly for her research showing that radiation, such as from X-rays, harms embryos, particularly in their early stages of development. — Emily Langer, Washington Post, "Liane Russell, scientist who put spotlight on danger of X-rays for embryos, dies at 95," 23 Aug. 2019 She was treated for colon cancer in 1999 with a combination of chemotherapy, radiation, and surgery. — CBS News, "Ruth Bader Ginsburg completes radiation therapy for tumor on pancreas," 23 Aug. 2019 Because these small stars put out much less radiation, the region where planets could have liquid water on their surfaces is much closer to the star. — John Timmer, Ars Technica, "Super-Earth at a nearby star is a Mercury-like hunk of rock," 20 Aug. 2019 Algae is also interesting because several species have their own natural methods of protecting themselves from UV radiation, something that could obviously also benefit humans. — Sarah Jacoby, SELF, "Can Spirulina and Other Algae Skin-Care Products Live Up to the Hype?," 13 Aug. 2019 Any underground cavity on the moon, after all, would provide shielding—from temperature swings, space radiation, micrometeoritic bombardment and sandblasting from the rocket engines of landing or departing spacecraft. — Leonard David, Scientific American, "Will Future Lunar Bases Be Underground?," 31 July 2019 These include potential health issues and risks for those living near the cell tower due to radio frequency radiation, possible negative impact on property values and aesthetic issues. — Elizabeth Marie Himchak, Pomerado News, "Seven Oaks board to host cell tower town hall meeting," 24 July 2019 Tracking unprecedented levels of radiation, the devices would click uncontrollably the deeper scientists and staffers waded towards the nuclear eruption. — Jake Fischer, SI.com, "Zion Williamson Creates Raucous Atmosphere in Summer League Debut," 5 July 2019These example sentences are selected automatically from various online news sources to reflect current usage of the word 'radiation.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for radiation
radiation
noun
English Language Learners Definition of radiation
: a type of dangerous and powerful energy that is produced by radioactive substances and nuclear reactions
medical
: the use of controlled amounts of radiation for the treatment of diseases (such as cancer)
: energy that comes from a source in the form of waves or rays you cannot see
See the full definition for radiation in the English Language Learners Dictionary
radiation
noun
ra·di·a·tion
| \ ˌrā-dē-ˈā-shən
\
\
Kids Definition of radiation
1
: the process of giving off energy in the form of waves or particles
2
: something that is radiated (as light or X-rays)
radiation
noun
ra·di·a·tion
| \ ˌrād-ē-ˈā-shən
\
\
Medical Definition of radiation
1
: energy radiated in the form of waves or particles
2a
: the action or process of radiating
with radiation of the pain there may be tenderness over the sciatic nerve— J. A. Key
b(1)
: the process of emitting radiant energy in the form of waves or particles
(2)
: the combined processes of emission, transmission, and absorption of radiant energy
3
: a tract of nerve fibers within the brain
especially
: one concerned with the distribution of impulses arising from sensory stimuli to the relevant coordinating centers and nuclei
the optic radiations