blood–brain barrier noun
: a naturally occurring barrier created by the modification of brain capillaries (as by reduction in fenestration and formation of tight cell-to-cell contacts) that prevents many substances from leaving the blood and crossing the capillary walls into the brain tissues—abbreviation BBB
Seen & Heard
What made you want to look up blood-brain barrier? Please tell us where you read or heard it (including the quote, if possible).