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Showing results for side effect. Search instead for side effect/2.
Definitions

side effect

NOUN
adverse or unwanted secondary effect
Synonyms
STRONGEST
aftereffect reaction
WEAK
aftermath aftertaste by-product carry-over concomitant corollary leftover offshoot secondary response side issue sidebar spinoff

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The moves are a side effect of the war with Iran, which has spread across more of the Middle East, creating tighter supplies of oil and petroleum products such as jet fuel.

From The Wall Street Journal • Apr. 1, 2026

Partaking in them is not without risk—ozone therapy, for example, has the potential side effect of something called an air embolism, which can lead to a stroke or heart attack.

From Slate • Mar. 30, 2026

Researchers at Pfizer were studying a drug intended to treat angina when participants reported an unexpected side effect.

From Science Daily • Mar. 14, 2026

Jonas’ lymphoma developed as a side effect of the medication he was taking for Crohn’s disease.

From Los Angeles Times • Mar. 13, 2026

The side effect was the golden age of newspapers.

From "The Mona Lisa Vanishes" by Nicholas Day

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.