Cancer (SIGN) /ˈkæn.səʳ/ US /-sɚ/
noun [C or U]
1. the fourth sign of the zodiac, relating to the period from 22 June to 22 July and represented by a crab, or a person born during this period
cancer (DISEASE) /ˈkænt.səʳ/ US /-sɚ/
2. [C or U] a serious disease that is caused when cells in the body grow in a way that is uncontrolled and not normal, killing normal cells and often causing death:
He died of liver cancer.
cancer of the cervix/stomach
a cancer patient
3. [C] a harmful activity that spreads quickly:
Drug abuse is a cancer which is destroying our society.
cancerous /ˈkænt.sər.əs/ US /-sɚ-/
a cancerous growth/tumor