a malignant tumour that develops when cells multiply in an unlimited way
the medical condition that is characterized by the presence of such a tumour or tumours
A cancer is a malignant tumour that develops when cells multiply in an abnormal and uncontrolled manner. Cancerous cells can invade and destroy nearby tissues and spread (or ‘metastasise’) to other areas of the body – by direct spread or via the blood and/or lymphatic systems — Dr John Cormack
a spreading evil in a person, society, etc
the cancer of hidden resentment — Irish Digest
(Cancer) in astronomy, a constellation (the Crab) depicted as a crab crushed beneath Hercules’ foot
(Cancer)
in astrology, the fourth sign of the zodiac
a person born under this sign
Cancerian /kanʹsiəri·ən, kanʹseə-/ adj and noun
cancerous adj
[Middle English from Latin cancer crab, cancer]