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
Both are preventative monoclonal antibodies, which deliver antibodies directly into the bloodstream to provide immediate protection.
—Annika Kim Constantino, CNBC, 26 June 2025
Beta-glucan slows the absorption of sugar into the bloodstream, preventing post-meal blood sugar spikes.25
Maintaining optimal blood sugar levels is essential for keeping yourself energized, preventing chronic disease, managing your mood and hunger, and more.
—Jillian Kubala, Health, 25 June 2025
The key difference is that these drugs, due to clever chemical engineering, last in the bloodstream for a solid week, rather than just a single day.
—Paul Sisson, San Diego Union-Tribune, 23 June 2025
Typically, these inflammatory molecules are transmitted via the bloodstream to whichever site they’re needed; in healthy individuals, the blood-brain barrier (BBB) usually prevents them from entering the brain.
—Mark Travers, Forbes.com, 21 June 2025
See All Example Sentences for bloodstream
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Annika Kim Constantino, CNBC, 26 June 2025
Beta-glucan slows the absorption of sugar into the bloodstream, preventing post-meal blood sugar spikes.25
Maintaining optimal blood sugar levels is essential for keeping yourself energized, preventing chronic disease, managing your mood and hunger, and more.
—Jillian Kubala, Health, 25 June 2025
The key difference is that these drugs, due to clever chemical engineering, last in the bloodstream for a solid week, rather than just a single day.
—Paul Sisson, San Diego Union-Tribune, 23 June 2025
Typically, these inflammatory molecules are transmitted via the bloodstream to whichever site they’re needed; in healthy individuals, the blood-brain barrier (BBB) usually prevents them from entering the brain.
—Mark Travers, Forbes.com, 21 June 2025
See All Example Sentences for bloodstream
Cite this Entry
“Bloodstream.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bloodstream. Accessed 9 Jul. 2025.
Copy CitationKids Definition
bloodstream
noun
blood·stream
-ˌstrēm
: the flowing blood in a living thing with a circulatory system
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