Cancer definition

noun

(1) Type genus of the family Cancridae

(2) The fourth sign of the zodiac; the sun is in this sign from about June 21 to July 22

(3) A small zodiacal constellation in the northern hemisphere; between Leo and Gemini

(4) (astrology) a person who is born while the sun is in Cancer

(5) Any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream