fluorouracil
noun
fluo·ro·ura·cil ˌflu̇r-ō-ˈyu̇r-ə-ˌsil 
-ˌsəl,
ˌflȯr-
: a fluorine-containing pyrimidine base C4H3FN2O2 used as a neoplastic agent to treat some kinds of cancer
Example Sentences
Recent Examples on the Web The Turtle Hospital on Marathon Key and the University of Florida’s Sea Turtle Hospital, working closely together, have used human anti-cancer drug treatments such as fluorouracil to decrease post-surgical recurrence of eye tumors in sea turtles. 
Jessica Alice Farrell, Smithsonian, 11 July 2018 The 16 drugs that Pfizer and Cipla will sell have unfamiliar names like vinblastine, bleomycin and fluorouracil. Donald G. Mcneil Jr., New York Times, 7 Oct. 2017
Jessica Alice Farrell, Smithsonian, 11 July 2018 The 16 drugs that Pfizer and Cipla will sell have unfamiliar names like vinblastine, bleomycin and fluorouracil. Donald G. Mcneil Jr., New York Times, 7 Oct. 2017 Word History
Etymology
fluor- + uracil
First Known Use
circa 1958, in the meaning defined above
Medical Definition
fluorouracil
noun
flu·o·ro·ura·cil ˌflu̇(-ə)r-ō-ˈyu̇r-ə-ˌsil, -ˌsəl
variants or 5-fluorouracil
ˈfīv-
: a fluorine-containing pyrimidine base C4H3FN2O2 used to treat some kinds of cancer