First recorded in 1650–60, anus is from the Latin word ānus ring, anus
< Latin -ānus; see -an
The anus is the hole in the middle of your buttocks. When you poop or fart, you're using your anus. When you talk about your anus, you're using a formal, scientific word. Many kids and adults are more likely to use a slangy term like butthole or bunghole when discussing their anus, but if you're speaking to adults or writing a paper, anus is the word you want. The anus might seem like a funny part of the body, and maybe it is, but it's also incredibly important. Without an anus, you'd die.
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Quantity of the Latin Termination -anus.—Proper names having the termination -anus are always long in Latin and short in Greek; thus, the Claudiānus, Luciānus, &c. of the Latins are Κλαυδιᾰνος and Λουκιᾰνος in Greek.
From Notes and Queries, Number 208, October 22, 1853 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc by Bell, George
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