giant cell tumor (Monarch Disease Ontology term MONDO_0002171) is a benign, intermediate, or malignant tumor that arises from the bone or soft tissue. It is characterized by the presence of multinucleated osteoclast-like giant cells. Also known as: giant cell neoplasm, giant cell tumor (morphologic abnormality), giant cell tumor (qualifier value), giant cell tumor NOS (morphologic abnormality), giant cell tumors (morphologic abnormality), giant cell tumour (morphologic abnormality), giant cell tumour (qualifier value), giant cell tumour NOS (morphologic abnormality).