bad rap – idiomatic expression a negative and often undeserved reputation —often used with bum or bad (Example: He got a bad (or bum) rap by the press.)

borne – adj. carried by : spread by — used in combination as in “waterborne” and “airborne”

genetically-modified - adjective containing genetic material that has been artificially altered so as to produce a desired effect

tumor – n. a mass of tissue found in or on the body that is made up of abnormal cells

contaminate – v. to make (something) dangerous, dirty, or impure by adding something harmful

chemotherapy – n. medical the use of chemicals to treat or control a disease (such as cancer)

radiation – n. medical the use of controlled amounts of radiation for the treatment of diseases (such as cancer)
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