blood-brain barrier (bl d br n )n. A physiological mechanism that alters the permeability of brain capillaries, so that some substances, such as certain drugs, are prevented from entering brain tissue, while other substances are allowed to enter freely. |
| blood-brain barrier A physiological mechanism that alters the permeability of capillaries in the brain, so that some substances, such as certain drugs, are prevented from entering brain tissue, while other substances are allowed to enter freely. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | blood-brain barrier - a mechanism that creates a barrier between brain tissues and circulating blood; serves to protect the central nervous system; "the brain was protected from the large molecules of the virus by the blood-brain barrier" barrier - anything serving to maintain separation by obstructing vision or access |
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