chordoma

chor·do·ma

noun \kȯr-ˈdō-mə\

plural chor·do·mas also chor·do·ma·ta \-mət-ə\

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