1. a marine mollusk with eight arms and two longer tentacles, capable of changing color and releasing ink as a defense mechanism
Usage: countable noun; common in marine biology and aquarium contexts
2. the internal shell or bone of a cuttlefish, used as a dietary supplement for birds or as a mild abrasive
Usage: often called cuttlebone; commonly used in pet care

Examples

• The cuttlefish is known for its remarkable ability to change color in seconds.
• When threatened, a cuttlefish releases a cloud of ink to escape predators.
• Cuttlefish are highly intelligent creatures with complex nervous systems.
• The aquarium has several cuttlefish on display in the deep-sea exhibit.
• Pet bird owners often provide cuttlebone, derived from cuttlefish, as a calcium source.
• Scientists study cuttlefish to understand how they control their skin pigmentation.