octopus

noun

oc·​to·​pus ˈäk-tə-pəs 

-ˌpu̇s

plural octopuses or octopi ˈäk-tə-ˌpī 

1

plural also octopodes äk-​ˈtä-​pə-​ˌdēz 

-​ˈtō-

: 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

… an octopus of a corporation which lends, buys, produces, and sells.

—Atlantic

Illustration of octopus

• octopus 1

The Plurals of Octopus: Usage Guide

The plurals of octopus are octopi, octopuses, and octopodes. Octopi is the oldest, having been adopted in the belief that words of Latin origin should have Latin plural forms. Though octopus did enter English via New Latin, it is in fact ultimately from Greek. For this reason, it was later given the Greek plural octopodes. In between the adoption of these etymology-based plural forms the word also gained a regular English plural: octopuses. This is now the most common plural form, with octopi also seeing some regular use. Octopodes is rare, but all three are accepted.

Examples of octopus in a Sentence

Recent Examples on the Web

There are shallow but rich dives; full-of-life, accessible wrecks; and thriving reefs, including my favorite spot, the unlikely cement plant, with seahorses and octopus reclining beneath its pier pilings—pilings that are fantastical once underwater. — Jonnie Bayfield, Condé Nast Traveler, 19 July 2026

The pearly pink chrome base gives the manicure an iridescent, underwater glow, while the 3D white tips mimic octopus tentacles curling over the ends of each nail. — Daisy Maldonado, InStyle, 17 July 2026

Neuron by neuron, squid have brains about as complex as that of dogs, and along with octopuses and cuttlefish, are the most intelligent invertebrates in the world. — Jeffrey Kluger, Time, 9 July 2026

In the film, Field portrays Tova, the cleaning lady who bonds with the somewhat cranky Marcellus, an octopus wise behind his years, in Netflix’s screen adaptation of Shelby Van Pelt’s bestselling novel. — Denise Petski, Deadline, 8 July 2026

Word History

Etymology

New Latin Octopod-, Octopus, from Greek oktōpous

First Known Use

1759, in the meaning defined at sense 1

Rhymes for octopus

• blunderbuss
• platypus
• xenopus
• puss

Kids Definition

octopus

noun

oc·​to·​pus ˈäk-tə-pəs 

plural octopuses or octopi -ˌpī 

1

: any of various sea mollusks that are cephalopods having eight muscular arms with two rows of suckers which hold objects (as its prey)

2

: something suggestive of an octopus

especially : a powerful grasping organization with many branches

Etymology

from scientific Latin Octopod-, Octopus "octopus," from Greek oktōpous, literally, "eight-footed," from oktō "eight" and pous "foot"