1. A marine mammal of the order Cetacea, including whales, dolphins, and porpoises.
Usage: scientific/biological term

1. Of, relating to, or belonging to cetaceans.
Usage: scientific/biological term

Examples

• Whales and dolphins are both cetaceans.
• The blue whale is the largest cetacean in the world.
• Cetacean species communicate with complex vocalizations.
• Marine biologists study cetacean behavior in the ocean.
• Porpoises are small cetaceans found in many coastal waters.
• The cetacean order includes over 90 different species.