bloodstream

noun

blood·​stream ˈbləd-ˌstrēm How to pronounce bloodstream (audio)
1
: the flowing blood in a circulatory system
2
: a mainstream of power or vitality
… introduce into the economic bloodstream a large amount of money …Harper's

Examples of bloodstream in a Sentence

The drug is now entering the bloodstream.
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.
His pancreas then produces a tiny pulse of insulin, a chemical whisper that echoes all through his bloodstream, telling different kinds of tissues to absorb the glucose. Ross Andersen, The Atlantic, 2 May 2026 Too much sugar in the blood puts heavy strain on the kidneys, which try to reabsorb glucose into the bloodstream. Samantha Agate, Charlotte Observer, 1 May 2026 Insulin sensitivity tends to decrease at night, meaning that your body isn’t as efficient at transporting sugar from your bloodstream to your cells. Gavin Escott, USA Today, 1 May 2026 According to Healthline, excess sugar in the bloodstream forces the kidneys to work overtime trying to reabsorb glucose. Samantha Agate, Sacbee.com, 1 May 2026 See All Example Sentences for bloodstream

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

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Cite this Entry

“Bloodstream.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bloodstream. Accessed 7 May. 2026.

Kids Definition

bloodstream

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

Medical Definition

bloodstream

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

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