bloodstream
noun
blood·stream
ˈbləd-ˌstrēm 
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 …—
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Harper'sExamples of bloodstream in a Sentence
The drug is now entering the bloodstream.
Recent Examples on the Web
When inhaled, these particles enter the lungs and can then pass into the bloodstream, increasing people’s risk of heart disease and decreasing lung function.
—Katelyn Richard, The Conversation, 9 Jan. 2026
From there, the alcohol enters your bloodstream.
—Brittany Dube, Health, 9 Jan. 2026
Research shows that caffeine increases the concentration of blood-thinning medication in the bloodstream, enhancing its effects.
—Carrie Madormo, Verywell Health, 7 Jan. 2026
During and after a workout, your muscles, fat and other organs release these molecules into the bloodstream, some of which make their way up to the brain.
—Dana G. Smith, New York Times, 7 Jan. 2026
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Katelyn Richard, The Conversation, 9 Jan. 2026
From there, the alcohol enters your bloodstream.
—Brittany Dube, Health, 9 Jan. 2026
Research shows that caffeine increases the concentration of blood-thinning medication in the bloodstream, enhancing its effects.
—Carrie Madormo, Verywell Health, 7 Jan. 2026
During and after a workout, your muscles, fat and other organs release these molecules into the bloodstream, some of which make their way up to the brain.
—Dana G. Smith, New York Times, 7 Jan. 2026
See All Example Sentences for bloodstream
Cite this Entry
“Bloodstream.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bloodstream. Accessed 16 Jan. 2026.
Copy CitationKids Definition
bloodstream
noun
blood·stream
-ˌstrēm
: the flowing blood in a living thing with a circulatory system
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