Definitions

1. adjective

relating to or characteristic of the underworld, especially the river Styx and its surrounding region in Greek mythology

“The cerberean landscape was shrouded in an eerie mist, reminiscent of the ancient Greek underworld.”

2. noun

a dog or other animal that is fiercely protective of its surroundings or territory, especially in a manner similar to the three-headed dog Cerberus in Greek mythology

“The cerberean beast growled fiercely as we approached its territory.”