noun, plural oc·to·pus·es, oc·to·pi [ok-tuh-pahy] /ˈɒk təˌpaɪ/.
Origin of octopus
Examples from the Web for octopi
Keith realized what those sounds signified: the octopi were striving to find some entrance to the NX-1!
The octopi ship had grasped them with another of its hawser arms, and was pulling them away.
Octopi have been killed having tentacles more than 30 feet in length.Elementary Zoology, Second Edition|Vernon L. Kellogg
After the inspection of the tentacles, Hemmy had been shoved to a corner of the octopi submarine.
A good many jelly-fish are thrown up; some gelatinous animals of a large size perhaps were octopi.Wintering in the Riviera|William Miller
noun plural -puses
Word Origin for octopus
1758, genus name of a type of eight-armed cephalopod mollusks, from Greek oktopous, literally "eight-footed," from okto "eight" (see eight) + pous "foot" (see foot (n.)). Proper plural is octopodes, though octopuses probably works better in English. Octopi is from mistaken assumption that -us in this word is the Latin noun ending that takes -i in plural.