Is Octopi Grammatically Correct?

Grammatically speaking, the plural for octopus is octopuses. As the Merriam-Webster dictionary points out, people use three different terms, however: octopi, octopuses, and octopodes

octopodes
Octopuses have a closed circulatory system, in which the blood remains inside blood vessels. Octopuses have three hearts; a systemic heart that circulates blood around the body and two branchial hearts that pump it through each of the two gills.
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. While “octopi” has become popular in modern usage, it's wrong.

Why is octopi incorrect?

According to Merriam-Webster, both octopuses and octopi are acceptable plurals. The reason for the octopi plural is because some people mistakenly associate octopus with Latin words like syllabus and alumnus. ... However, the word octopus is actually of Greek origin. The plural of octopus in Greek is, in fact, octopodes.

Why is octopus not plural octopi?

Octopi is the oldest plural of octopus, coming from the belief that Latin origins should have Latin endings. Octopuses is the next plural, which gives the word an English ending to match its adoption as an English word.

David Miller

David Miller

Executive Financial & Market Analyst

David Miller brings 15 years of experience in global economics, personal finance strategy, and market dynamics. He specializes in turning complex economic trends into actionable insights for everyday readers.