Etymology
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chemotherapy (n.)

"treatment of diseases by chemical substances," 1906, from German Chemotherapie, coined by German biochemist Paul Ehrlich (1854-1915), from chemo- + therapie (see therapy). Especially of cancer from 1950s; short form chemo attested by 1977.

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Definitions of chemotherapy

chemotherapy (n.)
the use of chemical agents to treat or control disease (or mental illness);
From wordnet.princeton.edu