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Medicine/Medical. puncture into the arachnoid membrane of the spinal cord, in the lumbar region, and withdrawal of spinal fluid, performed for diagnosis of the fluid, injection of dye for imaging, or administration of anesthesia or medication.
(med) insertion of a hollow needle into the lower region of the spinal cord to withdraw cerebrospinal fluid, introduce drugs, etc

lumbar puncture n.
Puncture into the subarachnoid space of the lumbar region for diagnostic or therapeutic purposes. Also called rachicentesis, rachiocentesis, spinal puncture, spinal tap.
lumbar puncture
The insertion of a hollow needle beneath the arachnoid membrane of the spinal cord in the lumbar region to withdraw cerebrospinal fluid for diagnostic purposes or to administer medication.


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