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 …—
Harper's
Harper'sExamples of bloodstream in a Sentence
The drug is now entering the bloodstream.
Recent Examples on the Web
Your daughter is at school cutting alphabet shapes out of paper when the virus enters her bloodstream.
—Elizabeth Bruenig, The Atlantic, 12 Feb. 2026
The more sugar or carbohydrates a food contains, the higher the levels of glucose that make it into the bloodstream.
—Angelica Bottaro, Verywell Health, 11 Feb. 2026
The tubing could be connected, via a catheter, directly to a rat’s bloodstream.
—Dhruv Khullar, New Yorker, 9 Feb. 2026
The reading is generally a mark of how well oxygen is traveling from the lungs into the bloodstream, and levels below 90% indicate hypoxia – a lack of sufficient oxygen.
—New Atlas, 9 Feb. 2026
See All Example Sentences for bloodstream
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Elizabeth Bruenig, The Atlantic, 12 Feb. 2026
The more sugar or carbohydrates a food contains, the higher the levels of glucose that make it into the bloodstream.
—Angelica Bottaro, Verywell Health, 11 Feb. 2026
The tubing could be connected, via a catheter, directly to a rat’s bloodstream.
—Dhruv Khullar, New Yorker, 9 Feb. 2026
The reading is generally a mark of how well oxygen is traveling from the lungs into the bloodstream, and levels below 90% indicate hypoxia – a lack of sufficient oxygen.
—New Atlas, 9 Feb. 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 17 Feb. 2026.
Copy CitationKids Definition
bloodstream
noun
blood·stream
-ˌstrēm
: the flowing blood in a living thing with a circulatory system
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