killer whale 
noun
A large toothed whale with distinctive black-and-white markings and a prominent dorsal fin. It lives in groups that hunt fish, seals, and penguins cooperatively. Also called orca.
- Orcinus orca, family Delphinidae.
- The most popular attractions, particularly with the kids, are the dolphins, the killer whale and the five beluga whales in a tank.
- Fifty or more feet long and weighing an estimated forty tons, Shonisaurus was one of the largest creatures of its time - about the size of a modern sperm whale and twice the size of a killer whale.