cerebrospinal fluid; spinal fluid
Medical term for the fluid surrounding the brain and spinal cord. Often used in clinical or anatomical contexts.
See also: 脳脊髄液
Cerebrospinal fluid is collected by lumbar puncture.
Examination of the cerebrospinal fluid revealed meningitis.
Figurative, somewhat old-fashioned expression for intellectual capacity or mental power. Often used in phrases like 脳漿を絞る (to rack one's brains).
He racked his brains and solved the difficult problem.