Definitions:

1. A large, deep-diving aquatic mammal species native to all the world's oceans, recognized for its extremely large head, high intelligence and complex social behaviors. NOUN
   • Cachalots have the largest brains of any living creatures on Earth.
2. Another name for the sperm whale, the largest toothed whale and the largest toothed predator in the world. NOUN
   • The cachalot is known for its deep-diving ability and its preference for squid.

Synonyms:

• physeter
• sperm whale