from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A diagnostic and at times therapeutic procedure performed to collect a sample of cerebrospinal fluid for biochemical, microbiological, and cytological analysis, or rarely to relieve increased intracranial pressure.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. removal by centesis of fluid from the subarachnoid space of the lumbar region of the spinal cord for diagnostic or therapeutic purposes
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