Learn how to say Octopus correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word octopus:
any cephalopod mollusc of the genera Octopus, Eledone, etc, having a soft oval body with eight long suckered tentacles and occurring at the sea bottom: order Octopoda (octopods)
a powerful influential organization with far-reaching effects, esp harmful ones
another name for spider (sense 8)