• WordNet 3.6
    • n radiation (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
    • n radiation the act of spreading outward from a central source
    • n radiation a radial arrangement of nerve fibers connecting different parts of the brain
    • n radiation the spread of a group of organisms into new habitats
    • n radiation energy that is radiated or transmitted in the form of rays or waves or particles
    • n radiation the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
    • n radiation syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours "he was suffering from radiation"
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Webster's Revised Unabridged Dictionary
  • Interesting fact: Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning
    • Radiation The act of radiating, or the state of being radiated; emission and diffusion of rays of light; beamy brightness.
    • Radiation The shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: The word "laser" stands for "Light Amplification by Stimulated Emission by radiation."
    • n radiation The act of radiating, or the state of being radiated; specifically, emission and diffusion of rays of light and the so-called rays of heat. Physically speaking, radiation is the transformation of the molecular energy of a hot body—that is, any body above the absolute zero (—273° C.)—into the wave-motion of the surrounding ether, and the propagation of these ether waves through space. Hence, every body is the source of radiation, but the character of the radiation varies, depending chiefly upon the temperature of the body; it is called luminous or obscure, according as it is or is not capable of exciting the sensation of light. See further radiant energy (under energy), also heat, light, spectrum.
    • n radiation The divergence or shooting forth of rays from a point or focus.
    • n radiation In zoology, the structural character of a radiate; the radiate condition, quality, or type; the radiate arrangement of parts. Also radiism.
    • n radiation In biology: The divergent evolution of several different organisms from a single ancestral form: as, the radiation of the placental mammals.
    • n radiation A group of organisms that is undergoing divergent modification.
    • n radiation In psychology, the extension of excitation within the nervous system to give rise to concomitant or secondary sensations.
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Chambers's Twentieth Century Dictionary
  • Interesting fact: Earth's magnetic field has been weakening. It seems to have lost 15% of its strength since 1670. At the present rate of decrease, it will reach zero in 2,000 years. Between the years 3500 and 4500, the magnetic field will not be sufficiently strong enough to ward off charged radiation from outer space.
    • n Radiation act of radiating: the emission and diffusion of rays of light or heat
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  • Swami Ramdas
    Swami Ramdas
    “Just as a flower gives out its fragrance to whomsoever approaches our uses it, so love from within us radiates towards everybody and manifests as spontaneous service.”


Webster's Revised Unabridged Dictionary
L. radiatio,: cf. F. radiation,


In literature:

Besides this, he has been radiating his animal heat into space in a far greater amount.
"Scientific American Supplement, Vol. XV., No. 388, June 9, 1883" by Various
Yet the earth receives only 1/2,170,000,000 part of the solar radiation.
"Outlines of the Earth's History" by Nathaniel Southgate Shaler
Only the inner decorations consist of radiating serrate lines.
"Illustrated Catalogue Of The Collections Obtained From The Indians Of New Mexico And Arizona In 1879" by James Stevenson
In fact, wouldn't we start feeling the effects of the radiation?
"The Space Pioneers" by Carey Rockwell
From the thrift-like tufts of foliage there radiates a set of stout round flower stalks, which are 3in.
"Hardy Perennials and Old Fashioned Flowers" by John Wood
His good humor became intensified, and his smile radiated upon the world about him.
"The Triumph of John Kars" by Ridgwell Cullum
Up near the South Pole, Tycho with its radiating open rills stood like a grim dark maw.
"Brigands of the Moon" by Ray Cummings
He worked with such vim, such animation, that he radiated light on every side.
"Little Journeys to the Homes of the Great - Volume 12" by Elbert Hubbard
Try to radiate good cheer.
"Vitality Supreme" by Bernarr Macfadden
We want scout-vehicles to cover the Keegark area with radiation-detectors.
"Ullr Uprising" by Henry Beam Piper

In poetry:

Where they toiled in bitter weather,
Braving rain and snow and sleet,
Gathering sticks of wood together,
We have radiators' heat.
"The Boys' And Girls' Thanksgiving of 1892" by Ella Wheeler Wilcox
Mary of Magdala was brought
From mysteries strange and dark and drear
To heights with joy and gladness fraught;
She radiates a luster clear.
"Ministering Women" by Nancy Rebecca Campbell Glass
You came into the shadow of my grief
(A lovely vision radiating light);
Your passing was as soulful and as brief
As winds among the forest pines at night.
"My Hope" by John William Streets
Indifferently, 'mid public, private haunts, in solitude,
Behind the mountain and the wood,
Companion of the city's busiest streets, through the assemblage,
It and its radiations constantly glide.
"A Riddle Song" by Walt Whitman

In news:

The largest solar storm since 2005, which hit Earth over the weekend and caused northern lights called auroras, peaked Tuesday after the Sun released a solar flare of radiation and plasma.
Projects radiating Fiesta awesomeness .
This radiation is present in nature without any contribution by man and we can do nothing about it.
Upon further inspection (and a lone door cracked open), the harmonic tone was radiating from the mandolin of Darren Nicholson.
Glamorous musical mastermind John O'Regan — will radiate when he brings gigantic songs like "I'm Just Me" to the Frequency Oct 28.
But weeks of radiation may be needed to kill cancer cells left behind.
New radiation therapy reduces treatment of gynecologic cancers from 5 weeks to 3 days.
I've heard rumors that radiation in mammograms can increase my risk of breast cancer.
Sneaker-prints in the dirt led to the arrest of two Hazleton area men in connection with the theft of some radiators, state police in Hazleton said.
Monitored radiation from underwater a-bomb test in 1955.
GreenChip Resonant Controller Delivers High Efficiency for High-Power LED Applications up to 400 W. Brought you by Brown Radiator & Auto Service.
Trevor Peterson of Cokato is starting radiation Wednesday, Feb 13 for his Hodgkin 's lymphoma, but his prognosis is excellent.
Delayed Radiation Therapy After Hysterectomy Ups Cancer Recurrence Risk.
It also said neutrinos are not bent by gravity, which can bend light and other forms of radiation.
The Cancer Center is scheduled to open early May 2011 with radiation therapy beginning on-site in mid-June.

In science:

In order to extract the non-radiative cross section from the measured radiative cross section, one normalizes to a well-known radiator function5 and to the PEP-II integrated luminosity, or - alternatively - to the yield of e+e− → µ+µ−γ events.
Measurement of the e+e- Multihadronic Cross Sections below 4.5 GeV with BaBar
The Discrete Transfer Radiation Model (DTRM) solves the radiative transfer equation throughout a domain by a method of ray tracing from surface elements on its boundaries and thus does not require information about the radiating volume itself.
A review of wildland fire spread modelling, 1990-present, 1: Physical and quasi-physical models
The angular momentum flux contains three terms which come, respectively, from the gravitational quadrupole radiation, the electromagnetic quadrupole radiation and a term arising from the electromagnetic (electric and magnetic) dipole radiation.
On Extracting Physical Content from Asymptotically Flat Space-Time Metrics
We need to apply a proper mapping of non-radiative subsystem in a radiative event to an on-shell non-radiative event in the LL subtraction. A mapping using momenta of the branched parton and the target parton works well for the initial-state radiation [345].
The NLO multileg working group: summary report
This problem is significantly more complicated mainly because of two issues: • Interference between radiation in the vacuum and medium-induced radiation In the absence of a medium, a parton produced in a hard process will radiate its large virtuality Q on a typical timescale 1/Q by developing a parton shower.
Jet Quenching in Heavy Ion Collisions