intramedullary
adjective
in·tra·med·ul·lary
| \ -ˈmed-ᵊl-ˌer-ē, -ˈmej-ə-ˌler-ē; -mə-ˈdəl-ə-rē
\
\
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