The watch-dog of Hades, whose duty it was to guard the entrance -- against whom or what does not clearly appear; everybody, sooner or later, had to go there, and nobody wanted to carry off the entrance. Cerberus is known to have had three heads, and some of the poets have credited him with as many as a hundred. Professor Graybill, whose clerky erudition and profound knowledge of Greek give his opinion great weight, has averaged all the estimates, and makes the number twenty-seven -- a judgment that would be entirely conclusive is Professor Graybill had known (a) something about dogs, and (b) something about arithmetic.

A monster, in the shape of a three-headed dog, guarding the entrance into the infernal regions, Hence: Any vigilant custodian or guardian, esp. if surly.

In Greek mythology, the three-headed dog that guards the entrance to the underworld.

CLAMP's manga and anime series Cardcaptor Sakura. His name is more commonly known in its romanized version, Kerberos, which is also often shortened to Kero-chan. He is voiced in his more common "hidden" form by Aya Hisakawa and Masaya Onosaka in his "true" form.

Cerberus is a blue egg-shaped ultrasound device to detect submerged divers. It is made by Qineti Q. It can distinguish a diver from a seal or dolphin or porpoise.

a Caldari Heavy Assault Ship in CCP Games ' EVE Online

A genus of East Indian serpents, allied to the pythons; the bokadam.