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

Examples of bloodstream in a Sentence

The drug is now entering the bloodstream.

Recent Examples on the Web

So, yeast found in the bloodstream or mold in the lungs. —Gabrielle Emanuel, NPR, 17 Apr. 2026

Due to the proximity of the organ, her heart is able to pump the nutrients through her bloodstream. —Zoey Lyttle, PEOPLE, 17 Apr. 2026

Prosecutors said a used Narcan container was observed at the scene and that the toxicology analysis showed naloxone (Narcan), in addition to fentanyl, in the toddler's bloodstream. —Meredith Deliso, ABC News, 16 Apr. 2026

The child’s cause of death was determined to be fentanyl toxicity, and the medical examiner also found the opioid reversal medicine Narcan (naloxone) in the bloodstream, the district attorney’s office said. —Bay Area News Group, Mercury News, 16 Apr. 2026

Word History

First Known Use

13th century, in the meaning defined at sense 1

Rhymes for bloodstream

• abeam
• airstream
• daydream
• downstream
• esteem
• extreme
• grapheme
• hakim
• hornbeam
• lexeme
• mainstream
• midstream

Kids Definition

bloodstream

noun

blood·​stream -ˌstrēm 

: the flowing blood in a living thing with a circulatory system

Medical Definition

bloodstream

noun

blood·​stream -ˌstrēm 

: the flowing blood in a circulatory system