The Big Apple Instances

And there’s this:I got started by knowing B, OAKLAND, and X, URETHANE, just because they were things that I knew.
Merriam-Webster permits it, but apparently it’s based on the mistaken assumption that the -US is a Latin noun ending that pluralizes into -I.
Oh, we once got into a big puzzle brouhaha over the plural OCTOPI.
A good scientist would probably say OCTOPODES.
How wrong is it?

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