The standard English plural of octopus is octopuses. However, the word octopus comes from Greek, and the Greek plural form is octopodes (Modern usage of octopodes is so infrequent that many people mistakenly create the erroneous plural form octopi, formed according to rules for Latin plurals.)
I love it when someone's trying to be a pedant and corrects to octopi when it's the only incorrect form of the three. And then you get to out-pedant them. And I love it even more when someone else does it first. Pedants unite!
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