Inkfish

Part of speech: noun

Definitions

1. A marine cephalopod known for ejecting ink as a defense mechanism ; any mollusk of the order that includes squids and octopuses, characterized by tentacles and ink sacs ; a creature living in ocean environments capable of releasing dark fluid to evade predators
2. A sea-dwelling animal with multiple arms that can squirt ink to escape danger ; a type of invertebrate with a soft body and ink-producing organ used to confuse attackers ; a member of a group of mollusks often studied for their unique locomotion and camouflage abilities
3. An oceanic invertebrate with tentacles that produces ink for protection ; a soft-bodied, often tentacled mollusk capable of discharging dark liquid when threatened ; a marine animal distinguished by its ink defense and flexible limbs used for movement and capturing prey

Etymology: "Inkfish" is about as transparent as compounds get: "ink" plus "fish," describing a creature that releases ink to escape predators. The name points to the cuttlefish, squid, and octopus, which are not fishes at all but cephalopod molluscs, so the word reflects an older everyday habit of calling any sea creature a fish rather than a precise zoological category. The ink itself is the real story behind the name. Cephalopods carry an ink sac that discharges a dark cloud of melanin-based fluid, which hides the animal while it slips away. Because the ink was valued for centuries as a pigment, the creature was often named for its most useful product, much as the cuttlefish's internal shell gave rise to its own name.

Synonyms: squid, cuttlefish, octopus