Abaddon

Abaddon is a Hebrew word meaning destruction.

In poetry it comes to mean place of destruction, and so the underworld or Sheol (cf. Job xxvi. 6; Prov. xv. 11). In Rev. ix. 11 Abaddon ((Abaddon) is used of hell personified, the prince of the underworld. The term is here explained as Apollyon (q.v.), the destroyer. , W. Baudissin (Herzog-Hauck, Realencyklo padie) notes that Hades and Abaddon in Rabbinic writings are employed as personal names, just as shemayya[?] in Dan. iv. 23, shamayim[?] (heaven), and makom[?] (place) among the Rabbins, are used of God.

From Gutenberg Encyclopedia (1911)