Dictionary

blood–brain barrier

noun \ˈbləd-ˈbrān-\

Definition of BLOOD-BRAIN BARRIER

:  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

First Known Use of BLOOD-BRAIN BARRIER

1934

blood–brain barrier

noun    (Medical Dictionary)

Medical Definition of BLOOD–BRAIN BARRIER

:  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

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