Erebus

n. god of darkness (Greek Mythology); Mount Erebus, volcano in Antarctica

n. dark gloomy region through which the dead must pass (Greek Mythology)

In Greek mythology Erebus (Έρεβος Erebos, "Deep blackness/darkness or shadow " from Ancient Greek ) was the son of a primordial God, Chaos, the personification of darkness and shadow, which filled in all the corners and crannies of the world. He was the offspring of Chaos alone. He was brother of Nyx and father with her of Aether and Hemera, according to Hesiod (c. 700 BC). According to Hyginus (c. AD 1), he was the father of Geras.
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Noun
1. (Greek mythology) Greek god of darkness who dwelt in the underworld; son of Chaos; brother of Nox; father of Aether and Day
(hypernym) Greek deity
(classification) Greek mythology

(n.)
The son of Chaos and brother of Nox, who dwelt in Erebus.
  

(n.)
A place of nether darkness, being the gloomy space through which the souls passed to Hades. See Milton's "Paradise Lost," Book II., line 883.
  

[Greek] Erebus was known as the embodiment of primordial darkness, the son of Chaos (who was the void from which all things developed, known also as Darkness). According to Hesiod's Theogony, Erebus was born with Nyx (Night), and was the father of Aether (the bright upper atmosphere) and Hemera (Day). Charon, the ferry-man who took the dead over the rivers of the infernal region, is also said to be the son of Erebus and Nyx. Later legend describes Erebus as the Infernal Region below the earth. In this version, Hades was split into two regions: Erebus, which the dead have to pass shortly after they have died, and Tartarus, the deepest region, where the Titans were imprisoned. Aristophanes' Birds says that Erebus and Nyx were also the parents of Eros, the god of love. He is often used metaphorically for Hades itself.