WordReference Random House Unabridged Dictionary of American English © 2020
lumbar puncture, 
  • Medicinepuncture 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. 
    • 1890–95

    Collins Concise English Dictionary © HarperCollins Publishers::
    lumbar puncture n
    1. insertion of a hollow needle into the lower region of the spinal cord to withdraw cerebrospinal fluid, introduce drugs, etc
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