Most people know that the word flu is a truncation of the more scientific term influenza, but only a few know about the origin after that. Arguably through Spanish, it comes from the Italian word influenza, which comes from the Italian word influentia. This had a distinguishably different definition, one which you may have figured out already: "influence" (except this is particularly in a supernatural sense; the broader influence that we know today evolved in the late 1500s from that word). This is because early people with flu were thought to be under the influence of the stars, so there you go: they had ill omens from above. This is from the verb influere, which meant "flow" or "stream", because the stars were supposed to be emanating a flow of influence. Eliminate the prefix -in and we have the verb fluere, with basically the same meaning (and the origin of fluent, through Latin fluentum, "relaxed"). Finally, this is from Proto-Indo-European bhel, meaning "to swell", making it the distant cousin of other words like follicle, bollocks, ballot, boil, beluga, and hundreds of other words. Anyway, I'm writing this blog post under the influence of the flu, which makes it all the more relevant and whimsical.
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AUTHORHello! I'm Adam Aleksic. This year, I graduated from Harvard University with a degree in Government and Linguistics. There, I co-founded the Harvard Undergraduate Linguistics Society and wrote a thesis on Serbo-Croatian language policy, magna cum laude. In addition to etymology, I also really enjoy trivia, politics, vexillology, geography, board games, conlanging, art history, and law.
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