merriam-webster.com/dictionary/cancer something evil that spreads destructively http://www.merriam-webster.com/dictionary/cancer Gall bladder leak symptoms See the full definition of cancer at merriam-webster.com » cancer merriam-webster.com/dictionary/cancer Merriam Webster Dictionary cancer cancer (Merriam-Webster Online Dictionary) (Merriam-Webster Online Dictionary) Merriam-Webster Dictionary (since 1828) merriam-webster cancer something evil that spreads destructively something evil that spreads destructively