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in·flu·en·za (ĭńflōō-ĕńzə)

[Italian, from Medieval Latin īnfluentia, influence (so called apparently from the belief that epidemics were due to the influence of the stars); see influence.]

noun 

  1. An acute contagious viral infection characterized by inflammation of the respiratory tract and by fever, chills, muscular pain, and prostration. Also called grippe
  2. Any of various viral infections of domestic animals characterized generally by fever and respiratory involvement.

derivatives

ińflu·eńzal
adjective