octopi
An attempted pluralization of the word "octopus".  "Octopus", however, does not pluralize as most other words ending in "-us" borrowed from Latin.  The proper Latin plural of "octopus" is "octopodes" (pronounced in English "awk-t@-POE-deez").  Saying "octopodes", however, is like pronouncing the first "r" in "February"--something seldom done and appreciated, however greatly, by very few.  Your best bet is just to stick with the good old English pluralization, "octopuses".
While the two syllabontes of our mollusk neurobiology class differed in some ways, they both mentioned a discussion of how octopodes *octopi, while certainly not as intelligent as homines sapientes, were nonetheless the smartest of the invertebrata.