tumour
/ˈtuːmər/
noun
- An abnormal mass of tissue that forms when cells grow and divide more than they should. Tumors can be benign (not cancer) or malignant (cancer).
- Most breast lumps turn out to be benign tumors, not cancer.
- Chemotherapy is often used to shrink malignant tumors.
- The doctor found a small tumor in her lung during the routine checkup.