intrathecal


in·tra·the·cal

adj \-ˈthē-kəl\

Definition of INTRATHECAL

: introduced into or occurring in the space under the arachnoid membrane of the brain or spinal cord <intrathecal chemotherapy and cranial irradiation—Journal of the American Medical Association>
in·tra·the·cal·ly \-kə-lē\ adverb

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