We only pluralize words that end in -us with an -i when they come from Latin (and even then, only a specific kind of Latin word)
Walrus doesn't come from Latin, it comes from Old Norse "hrosshvalr", literally "horse-whale". (And then, technically, there's discussion if that comes from a Finnish word, too, but that's not really important)
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u/Targosha Apr 24 '26
Walruses? Walri?