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lumbar puncture

noun
1.
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.
Also called spinal tap.
Origin
1890-1895
1890-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lumbar puncture

lumbar puncture

noun
1.
(med) insertion of a hollow needle into the lower region of the spinal cord to withdraw cerebrospinal fluid, introduce drugs, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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lumbar puncture in Medicine

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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lumbar puncture in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for lumbar puncture

direct aspiration (fluid withdrawal) of cerebrospinal fluid (CSF) through a hollow needle. The needle is inserted in the lower back, usually between the third and fourth lumbar vertebrae, into the subarachnoid space of the spinal cord where the CSF is located. Lumbar puncture is generally performed to obtain pressure measurements and to withdraw CSF in order to secure a sample of CSF for cellular, chemical, and bacteriologic examination; to administer spinal anesthetics or antibiotics; to inject air or a radiopaque or water-soluble contrast medium substance for myelography; or to inject a radioactive substance to assist in the diagnosis of CSF leak or hydrocephalus.

Learn more about lumbar puncture with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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