(medicine, oncology) A disease in which the cells of a tissue undergo uncontrolled (and often rapid) proliferation. / (figuratively) Something damaging that spreads throughout something else.

(slang) Extremely unpleasant and annoying.

(obsolete, intransitive) To grow into a cancer; to become cancerous.

(oncology) Relating to or affected with cancer. / (figuratively) Growing or spreading rapidly to the point of harm. / (slang) Extremely unpleasant; detestable.

(astronomy) A constellation of the zodiac supposedly shaped like a crab.

Someone with a Cancer star sign.

plural of cancer

The state or quality of being cancerous.

plural of Cancer

In a cancerous manner; like a cancer; malignant; spreading. / With cancer.