Among words ending in -um it seems worth drawing attention to the word curricula, plural of curriculum, and warning against confusion with the adjective curricular (as in extra-curricular). It’s simple! The -i ending comes from the belief that words of Latin origin should have Latin ending in English (while octopus may ultimately come from Greek it had a stay in New Latin before arriving here). Common usage appears to indicate a slight preference for termini rather than terminuses, but syllabuses rather than syllabi. What Are The Plurals Of "Octopus," "Hippopotamus," and "Syllabus"?
It is the most commonly-accepted plural form of octopus. Also, you’ll hear people call more than one octopus “octopi,” following the -us rule, but because of “octopus”‘s Greek roots, its plural is actually “octopuses”!
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The accusative plural of octopus is still octopodes, but in the singular it's octopodem.
If you are 13 years old when were you born? Octopus is not a simple Latin word of the second declension, but a Latinized form of the Greek word oktopous, and its ‘correct’ plural would logically be octopodes.
In Latin, some plurals end with an i.
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How do you make octopus plural?
The i was a mistake, but so many people adopted it that it became an acceptable alternative. Add -es for names ending in "s" or "z" and add -s for everything else. If you are 13 years old when were you born?
It is the most commonly-accepted plural form of octopus. Why don't libraries smell like bookstores?
Incident of a Voyage in the Banda Sea—An Octopus Who Is Injured by a Sailor Calls Upon His Companions for Help—They Respond Promptly, and a Gang of Octopi Take Control of the Deck of the Vessel, Driving the Crew Below.— (headline and caption) Chicago Daily Tribune, 15 Jan. 1888, It is certain that the octopi do attain to a very large size in the Indian seas; and there is nothing improbable in their taking hold of a man and drowning him.— Penny Magazine for the Diffusion of Useful Knowledge (London, Eng. Rule of thumb: if English gets the opportunity to trip you up, it will.
Like many nouns, it has a few acceptable plural forms.
English words of Latin or Greek origin have rather unpredictable plurals, and each one usually depends on how well established that particular word is. Although it is often supposed that octopi is the ‘correct’ plural of octopus, and it has been in use for longer than the usual Anglicized plural octopuses, it in fact originates as an error. Explore The English Language
Here Be Dragons: A Creature Identification Quiz.
is, one must decide on which plural form to use. Macon Telegraph (Macon, GA), 24 Jun.