What is the word origin of influenza?

The word "influenza" has its origins in the Italian language. It is derived from the Italian phrase "influenza di cielo," which literally means "influence of the heavens." This phrase was used in the 15th and 16th centuries to describe the widespread outbreak of an illness that was believed to be caused by astrological influences. The term "influenza" was later adopted in English and other languages to refer to the viral infection that causes flu-like symptoms.