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

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