Etymology
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febrile (adj.)
1650s, from Medieval Latin febrilis "pertaining to fever," from Latin febris "a fever" (see fever).
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antifebrile (n.)
also anti-febrile, 1660s, "having the property of abating fever," from anti- + febrile. As a noun, "substance which abates fever," 1859.
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Lassa 
1970 in reference to a febrile disease of tropical Africa, from Lassa, name of a village in northeastern Nigeria.
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dengue (n.)

"febrile epidemic disease of the tropics," 1828, from West Indian Spanish dengue, from an African source, perhaps Swahili dinga "seizure, cramp," with form influenced by Spanish dengue "prudery" (perhaps because sufferers walk stiffly and erect due to the painful joints which characterize the disease). The disease is from East Africa and was introduced into the West Indies in 1827.

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