hades; realm of the dead; the netherworld
Literary or religious term for the world of the dead, often used in mythological or spiritual contexts. Not an everyday word.
The ancient Greeks called the realm of the dead Hades.
He claimed to be a messenger from the netherworld.
Sino-Japanese compound of 幽 (yū, 'dim, secluded, nether') and 界 (kai, 'world, realm'). The exact historical derivation is uncertain, but the spelling is conventionally associated with the concept of a hidden spirit world.