myelotomy

noun
my·e·lot·o·my | \ˌmī-ə-ˈlät-ə-mē \
plural myelotomies

Medical Definition of myelotomy 

: surgical incision of the spinal cord especially : section of crossing nerve fibers at the midline of the spinal cord and especially of sensory fibers for the relief of intractable pain

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