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side effect (consequence)


any adverse and unwanted secondary effect


phenomenon noun (natural phenomena)


side effects

Original source:

Princeton WordNet



All senses of side effect...

Definition references


Side effect

an effect, whether therapeutic or adverse, that is secondary to the one intended; although the term is predominantly employed to describe adverse effects, it can also apply to beneficial, but unintended, consequences of the use of a drug. Occasionally,... (39 of 759 words)

en​.wikipedia​.org​/wiki​/Side effect

Side effect (disambiguation) | side effects

an effect that is secondary to the one intended. Side effect or side effects may also refer to: Side Effects (2005 film), starring Katherine Heigl, a satirical look at the pharmaceutical industry | Side Effects (2013 film), directed by Steven... (39 of 251 words, 15 definitions)

en​.wikipedia​.org​/wiki​/Side effect (disambiguation)

Collins Dictionary:

side effect

any unwanted nontherapeutic effect caused by a drug | any secondary effect, especially an undesirable one (15 of 416 words, 2 definitions, 9 usage examples)



side effect | side effects [plural] | side-effect [sense-specific] | by-product [synonym, sense-specific] | untoward [synonym, sense-specific] | unintentional [synonym, sense-specific]

[idiomatic] An unintended consequence of any action in addition to the intended consequence of that action. | [idiomatic, medicine] An adverse effect, an unintended consequence of a drug or therapy; usually not a beneficial effect. | [computing] A... (36 of 90 words, 3 definitions, 4 usage examples)

en​.wiktionary​.org​/wiki​/side effect


side effect | side reaction

a secondary and usually adverse effect (as of a drug) (10 of 76 words, 1 usage example)

www​.merriam-webster​.com​/dictionary​/side effect

Macmillan British Dictionary:

side effect [countable] | side effects [plural]

an effect of a medicine that is not intended and could be unpleasant | any additional result that you did not expect or want (23 of 68 words, 2 definitions, 2 usage examples)


Oxford Dictionary:

side effect

a secondary, typically undesirable effect of a drug or medical treatment (11 of 50 words, 1 usage example)


Random House Dictionary:

side effect

any effect of a drug, chemical, or other medicine that is in addition to its intended effect, especially an effect that is harmful or unpleasant. | ... (25 of 44 words, 2 definitions, 1 usage example)


Cambridge Dictionary:

side effect

an unpleasant effect of a drug that happens in addition to the main effect (14 of 25 words, 1 usage example)


American Heritage Dictionary:

side effect

A peripheral or secondary effect, especially an undesirable secondary effect of a drug or therapy. (15 of 18 words)


Britannica Encyclopedia:

fallout [nuclear physics]

deposition of radioactive materials on Earth from the atmosphere. The terms rain out and snow out are sometimes used to specify such deposition during ... (24 of 355 words, 1 image)


Columbia Encyclopedia:


minute particles of radioactive material produced by nuclear explosions (see atomic bomb; hydrogen bomb; Chernobyl) or by discharge from nuclear-power ... (20 of 131 words)


New World Dictionary:


[United States] the descent to earth of radioactive particles, as after a nuclear explosion | [United States] these particles | whatever comes as an ... (22 of 22 words, 3 definitions, pronunciation)


Encarta Dictionary:

side effect | side effects [plural]

an undesirable secondary effect of a drug or other form of medical treatment | a usually undesirable secondary effect produced by something (21 of 37 words, 2 definitions)

encarta​.msn​.com​/dictionary 1861735158​/definition​.html  [offline]

Audio references

Macmillan British Dictionary:

side effect [countable] | side effects [plural]

Audio: British English pronunciation of "side effect"


Macmillan American Dictionary:

side effect [countable] | side effects [plural]

Audio: North American pronunciation of "side effect"


Cambridge Dictionary:

side effect

Audio 1: British English pronunuciation of "side effect"

Audio 2: North American English pronunuciation of "side effect"


Google Dictionary:

side effect | side effects [plural]

Audio: English pronunciation of "side effect"

www​.google​.com​/#hl=en&tbs=dfn​:1&fp=1&q=side effect

Page last updated: 2013-06-26

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