Etymology
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Words related to carcinogen

carcinoma (n.)
"a propagating malignant tumor," 1721, from Latin carcinoma, from Greek karkinoma "a cancer," from karkinos "a cancer," literally "a crab" (see cancer) + -oma. Related: Carcinomatous. The classical plural is carcinomata.
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-gen 
word-forming element technically meaning "something produced," but mainly, in modern use, "thing that produces or causes," from French -gène (18c.), from Greek -genes "born of, produced by," which is from the same source as genos "birth," genea "race, family," from PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups. First used in late 18th century French chemistry (see oxygen), it probably involves a misunderstanding of -genes, as though it meant "that which produces."
carcinogenic (adj.)
"cancer-causing," 1926, from carcinogen + -ic.
*kar- 

also *ker-, Proto-Indo-European root meaning "hard."

It forms all or part of: -ard; Bernard; cancer; canker; carcinogen; carcinoma; careen; chancre; -cracy; Gerard; hard; hardly; hardy; Leonard; Richard; standard.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit karkatah "crab," karkarah "hard;" Greek kratos "strength," kratys "strong;" "hard;" Old English heard, German hart "solid and firm, not soft."