blood·​stream ˈbləd-ˌstrēm How to pronounce bloodstream (audio)
: the flowing blood in a circulatory system
: a mainstream of power or vitality
introduce into the economic bloodstream a large amount of moneyHarper's

Examples of bloodstream in a Sentence

The drug is now entering the bloodstream.
Recent Examples on the Web But when quercetin enters the bloodstream, it gets converted into quercetin glucuronide — a compound that blocks the enzyme that turns acetaldehyde into acetate. María Luisa Paúl, Washington Post, 23 Nov. 2023 According to an autopsy report obtained by the outlet, there was evidence of ethanol in the athlete's bloodstream at the time of the accident and his blood alcohol concentration (BAC) was estimated to be 0.124. Esther Kang, Peoplemag, 17 Nov. 2023 Concentrations of cancer-causing micro-particles that enter the bloodstream through the lungs have soared in recent days to 30 times the danger limit set by the World Health Organization. Sameer Yasir, New York Times, 12 Nov. 2023 The vaccine enters your bloodstream and prompts an immune response, Purvi Parikh, MD, an infectious disease specialist at NYU Langone Health, told Health. Korin Miller, Health, 31 Oct. 2023 Betty's blood samples were sent to the Minnesota Department of Health for testing, where medical professionals concluded that 29 ng/ml of colchicine was in her bloodstream at her time of death. Christina Coulter, Fox News, 24 Oct. 2023 Some drugs can become concentrated in fat tissues and not in the bloodstream. Jonel Aleccia, Fortune Well, 7 Nov. 2023 The Centers for Disease Control and Prevention (CDC) explains that having too much blood sugar in the bloodstream will overwhelm our liver and muscles that normally store blood sugar and cause the insulin in our bodies to store any excess in other places. Audrey Noble, Vogue, 28 Oct. 2023 What To Know About Supplements A Quick Review IV vitamin therapy delivers essential nutrients directly into your bloodstream through a vein in your arm. Claire Gillespie, Health, 18 Oct. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'bloodstream.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

13th century, in the meaning defined at sense 1

Time Traveler
The first known use of bloodstream was in the 13th century

Dictionary Entries Near bloodstream

Cite this Entry

“Bloodstream.” Dictionary, Merriam-Webster, Accessed 3 Dec. 2023.

Kids Definition


blood·​stream -ˌstrēm How to pronounce bloodstream (audio)
: the flowing blood in a living thing with a circulatory system

Medical Definition


blood·​stream -ˌstrēm How to pronounce bloodstream (audio)
: the flowing blood in a circulatory system

More from Merriam-Webster on bloodstream

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