heart failure

noun

1
: a condition in which the heart is unable to pump blood at an adequate rate or in adequate volume
2
: cessation of heartbeat : death

Examples of heart failure in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
For this new study in particular, the researchers focused on the 5FU, which often both fails to reach cancer cells efficiently and attacks healthy tissue—causing side effects like nausea, fatigue and, in rare cases, even heart failure. Hannah Millington, MSNBC Newsweek, 4 Nov. 2025 Additionally, participants who filled at least two melatonin prescriptions at least 90 days apart had an 82% higher risk of developing heart failure compared with those who did not use melatonin, according to the observational study. Angelica Stabile, FOXNews.com, 4 Nov. 2025 Melatonin users were also more than three times as likely to be hospitalized for heart failure and about twice as likely to die from any cause. Kristen Rogers, CNN Money, 4 Nov. 2025 Joyce Oen-Hsiao, an associate professor of cardiovascular medicine at Yale School of Medicine, told the Washington Post that poor sleep can cause poor heart health — and cited insomnia as a possible cause for heart failure. Cara Lynn Shultz, PEOPLE, 3 Nov. 2025 See All Example Sentences for heart failure

Word History

First Known Use

1574, in the meaning defined at sense 1

Time Traveler
The first known use of heart failure was in 1574

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Cite this Entry

“Heart failure.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heart%20failure. Accessed 8 Nov. 2025.

Medical Definition

heart failure

noun
1
: a condition in which the heart is unable to pump blood at an adequate rate or in adequate volume compare angina pectoris, congestive heart failure, coronary failure, heart attack
2
: cessation of heartbeat : death

More from Merriam-Webster on heart failure

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