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RADIATION

Pronunciation (US): 

 Dictionary entry overview: What does radiation mean? 

RADIATION (noun)
  The noun RADIATION has 7 senses:

1. energy that is radiated or transmitted in the form of rays or waves or particles
2. the act of spreading outward from a central source
3. 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
4. the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
5. the spread of a group of organisms into new habitats
6. a radial arrangement of nerve fibers connecting different parts of the brain
7. (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance

  Familiarity information: RADIATION used as a noun is common.


 Dictionary entry details 


RADIATION (noun)


Sense 1radiation [BACK TO TOP]

Meaning:

Energy that is radiated or transmitted in the form of rays or waves or particles

Classified under:

Nouns denoting natural phenomena

Hypernyms ("radiation" is a kind of...):

energy ((physics) the capacity of a physical system to do work; the units of energy are joules or ergs)

Hyponyms (each of the following is a kind of "radiation"):

solar radiation (radiation from the sun)

electromagnetic radiation; electromagnetic wave; nonparticulate radiation (radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge)

cosmic radiation (radiation consisting of cosmic rays)

ionizing radiation (high-energy radiation capable of producing ionization in substances through which it passes)


Sense 2radiation [BACK TO TOP]

Meaning:

The act of spreading outward from a central source

Classified under:

Nouns denoting acts or actions

Hypernyms ("radiation" is a kind of...):

emanation; emission (the act of emitting; causing to flow forth)

Hyponyms (each of the following is a kind of "radiation"):

bombardment (the act (or an instance) of subjecting a body or substance to the impact of high-energy particles (as electrons or alpha rays))


Sense 3radiation [BACK TO TOP]

Meaning:

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

Classified under:

Nouns denoting stable states of affairs

Synonyms:

radiation sickness; radiation syndrome; radiation

Context example:

he was suffering from radiation

Hypernyms ("radiation" is a kind of...):

syndrome (a pattern of symptoms indicative of some disease)


Sense 4radiation [BACK TO TOP]

Meaning:

The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay

Classified under:

Nouns denoting natural processes

Synonyms:

radioactivity; radiation

Hypernyms ("radiation" is a kind of...):

emission (the release of electrons from parent atoms)

Hyponyms (each of the following is a kind of "radiation"):

corpuscular radiation; particulate radiation (a stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons))


Sense 5radiation [BACK TO TOP]

Meaning:

The spread of a group of organisms into new habitats

Classified under:

Nouns denoting natural events

Hypernyms ("radiation" is a kind of...):

spread; spreading (process or result of distributing or extending over a wide expanse of space)

action; activity; natural action; natural process (a process existing in or produced by nature (rather than by the intent of human beings))

Hyponyms (each of the following is a kind of "radiation"):

adaptive radiation (the development of many different forms from an originally homogeneous group of organisms as they fill different ecological niches)


Sense 6radiation [BACK TO TOP]

Meaning:

A radial arrangement of nerve fibers connecting different parts of the brain

Classified under:

Nouns denoting body parts

Hypernyms ("radiation" is a kind of...):

neural structure (a structure that is part of the nervous system)


Sense 7radiation [BACK TO TOP]

Meaning:

(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance

Classified under:

Nouns denoting acts or actions

Synonyms:

actinotherapy; radiation therapy; radiotherapy; irradiation; radiation

Hypernyms ("radiation" is a kind of...):

therapy ((medicine) the act of caring for someone (as by medication or remedial training etc.))

Domain category:

medical specialty; medicine (the branches of medical science that deal with nonsurgical techniques)

Hyponyms (each of the following is a kind of "radiation"):

phototherapy (the use of strong light to treat acne or hyperbilirubinemia of the newborn)

Curietherapy; radium therapy (the use of radium in radiation therapy)

X-ray therapy (the therapeutic use of X rays)


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"Let sleeping dogs lie." (Dutch proverb)

 RADIATION: related words searches 

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