[kiriath_jearim]

I thought that the plural of "octopus" was "octopii".

[dighton]

Webster's II and III give octopuses, octopi (one i), and octopodes as plural.

[Izzy Dunne]

I thought that the plural of "octopus" was "octopii".

You thought wrong.

The "-us" to "-i" rule that a lot of people go by should be "-ius" to "-ii".

As in "radius" to "radii"

[proxy_user]

It is Greek, not Latin.

'octo', meaning 8, plus 'pous' meaning foot.

The plural of 'pous' would be 'podes', because it is third declension. However, in ancient Greek, I believe this word was usually treated as undeclinable, since it doesn't make sense to pluralize the second element.

[Blzbba]

It's 'Octopi' or 'Octopuses', according to dictionary.com

[Hayzo]

I thought it was 'Octopussy' Mr. Bond!

[PatoLoco]

Merriam-Webster says octopuses is ok.

http://m-w.com/cgi-bin/dictionary?book=Dictionary&va=octopus

Main Entry: oc·to·pus
Pronunciation: 'äk-t&-p&s, -"pus
Function: noun
Inflected Form(s): plural -pus·es or oc·to·pi /-"pI/
Etymology: New Latin Octopod-, Octopus, from Greek oktOpous
1 : any of a genus (Octopus) of cephalopod mollusks that have eight muscular arms equipped with two rows of suckers; broadly : any octopod excepting the paper nautilus
2 : something that resembles an octopus especially in having many centrally directed branches
[octopus illustration]

[The Spirit Of Allegiance]

I thought that the plural of "octopus" was "octopii".

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The actual quote was: "Let them eat octoCAKE"