蛸

ocellated octopus (Octopus ocellatus)

giant Pacific octopus (Enteroctopus dofleini); North Pacific giant octopus

long-armed octopus (Octopus minor)

greater argonaut (species of paper nautilus, Argonauta argo)

winged argonaut (species of paper nautilus, Argonauta hians)

seven-arm octopus (Haliphron atlanticus)

algae octopus (Abdopus aculeatus)

starry night octopus (Octopus luteus)

Colloquial

ganglion cyst caused by carrying a mikoshi on one's shoulders

takoyaki shop; takoyaki stall

Medicine

takotsubo cardiomyopathy