is it octopus or octopi?

Question

what is one of this creature called?

Answer 1

One creature is an octopus.
Octopi is wrong even for the plural form because the word is of Greek origin and not Latin.

Answer 2

Octopus is a word that is not entirely Anglicized,
so its plural is not definitely fixed. It depends on
whether the word is regarded as pure English or
not. The word ultimately comes from Greek, but
it occurs in slightly different form in Latin, as well.
The Romans adopted many words from Greek
into Latin.

My dictionary gives three plurals for octopus. As
an English word, octopuses, as a Latin word,
octopi, as a Greek word octopodes or octopoda.
Octopoda is the scientific name of the group. In
English either octopuses or octopi is acceptable.

Answer 3

One octopus
Technically two octopi -

but octopus as a collective plural is becoming more accepted

Answer 4

Octopus obviously.

Several is Octopuses - NOT 'Octopi' contrary to popular belief due to the etymological roots of the name.

Answer 5

octopus is single, octopi is plural

Answer 6

one is an octopus. several are octopuses or octopi .

Answer 7

"Octopus" is a masculine singular Latin noun, derived from Greek. Most singular masculine Latin nouns end in "us", and when they do, the plural form ends in "i". nucleus - nuclei; radius - radii; alumnus - alumni; octopus - octopi.