- Any of various malignant neoplasms characterized by the proliferation of anaplastic cells that tend to invade surrounding tissue and metastasize to new body sites.

- The pathological condition characterized by such growths.
A pernicious, spreading evil.

- A term often used as an insult when referring to someone who is a pathelogical source of trouble and discord within a group. Sadly, this word is usually used as an insult when the moron looking to talk trash about another person, and just can't come up with anything more original. See skippy mcnipplehead, hag, clannie, chickenshit, and the queen.
Use one and two: "How sad, did you hear about George? He was diagnosed with cancer."

Use three: "I'm taking measures to make sure that this crap doesn't happen anymore. I usually try to stay out of it, but I've hit my limit. Now it's my turn. Remove the cancer...then and only then can the healing begin. We'll be ok."

To which a proper response would be...

"Hell, If we're "CANCER", then ya'll are "AIDS", because at least we only destroy ourselves... you people destroy each other."
by The Cancer Coven November 22, 2004

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The fourth of the 12 zodiac signs, represented by the crab, running from June 23 to July 23.
Cancer is a water sign.
by GuidoPosse69 February 23, 2005

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An uncontrolled meiotic division of a useless cell.
Breast cancer, lung cancer, colon cancer, testicular cancer, stomach cancer, etc.
by jr April 09, 2004

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The 4th astrological sign of the zodiac. The sun is in this sign from June 21st to July 22nd. Cancer's element is Water and quality is Cardinal. The moon is it's ruler, governing the feeling nature of an individual such as emotional makeup, and unconscious habits. They have maternal instincts and are very receptive. The power of the moon is usually hidden until an eclipse where we are reminded that it is no less influential than the sun. It can be hard for Cancer to let go of the past, they are moody people but are loving and imaginative. They are considered to be compatible with signs of the same element (Scorpio, Pisces, and Cancer itself). Their main body part is the breast and the polar opposite of Cancer is Capricorn.
Cancer is the mother of the signs... tits or GTFO
by bromodragonfly August 04, 2010

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Online Social Meanings, mostly used in forums:
Group of people who encourages more people (hence cancer's spreading nature) go join a certain forum with then corrupts the traditions and influenced (usually in a faggotry sense) the forum.

In other words, Newfags in numbers who couldn't shut up.
The cancer has killed this forum, lets go somewhere else.
by Anonymous asdfasdf July 25, 2008

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The only superpower that humans can possess.
Cancer-boy: DUDE my cells are growing out of control!!!!!!
by JJW00SH October 16, 2007

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Cancer is a class of diseases or disorders characterized by uncontrolled division of cells and the mass of these cells invade other tissues, either by direct growth into adjacent tissue through invasion or by implantation into distant sites by metastasis (in which cancer cells are transported through the blood or lymphatic system).

There is a number of cures and mechninisims for cancer. these include; chemotherapy, radiotherapy, surgey, steriods
as well as many other experimental drugs.
There are a wide number of chemotherapy drugs, there is not one chemotherapy to treat all cancers.
cancer is a terrible disease, but it is not a death scentence. People think there is no cure for cancer but there is. Many people are living and recovering from cancer. That is the mistake people make, there is a cure for cancer, there is. Do not be scared of cancer, not all cases end heatbreak.
by sarah-3-2321 June 11, 2006

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