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in·tra·med·ul·lary | \ -ˈmed-ᵊl-ˌer-ē, -ˈmej-ə-ˌler-ē; -mə-ˈdəl-ə-rē 
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\Medical Definition of intramedullary
: situated or occurring within a medulla
an intramedullary tumor of the spinal cord especially : involving use of the marrow space of a bone for support intramedullary pinning of a fracture of the thigh
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