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There are two accepted forms for possessive singular nouns ending in s:

Add an apostrophe (') after the existing s at the end of the word: octopus'

Add an apostrophe s ('s) after the existing s at the end of the word: octopus's

There are two accepted plural forms for octopus, they are octopuses and ocotopi.

The plural possessive forms are octopuses' and octopi's.

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Q: What is the singular and plural possessive of octopus?
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