chordoma
noun
chor·do·ma
| \ kȯr-ˈdō-mə
\
\
plural chordomas
also chordomata\ -mət-ə
\
\
Medical Definition of chordoma
: a malignant tumor that is derived from remnants of the embryonic notochord and occurs along the spine attacking especially the bones at the base of the skull or near the coccyx