Orca (noun)

A large predatory dolphin found in all the world's oceans, having a black back and white belly and noted for its powerful and distinctive dorsal fin.

Origin:

Mid 19th century: from latin orcinus orca, from orca "whale, monster".

Examples:

1. The orca is one of the largest members of the dolphin family.
2. Orcas are apex predators, meaning they sit at the top of the food chain.
3. Orcas have a complex social structure and are often seen traveling in pods.
4. The orca is known for its intelligence and playfulness.
5. Orcas are also known to attack and kill other marine mammals, including seals and whales.