People's Dictionary of the Bible
Abaddon, or Apollyon (a-bâd'dŏn or a-pŏl'yŏn). The former name is Hebrew and the latter Greek, and both signify the destroyer. Job 31:12; Revelation 9:11. He is the same as the "angel of the abyss," that is, the angel of death, or the destroying angel. Psalms 78:49. Abaddon frequently occurs in the Hebrew, and is translated "destruction," meaning often the world of the dead. Job 26:6; Job 28:22; Psalms 88:11; Proverbs 15:11.
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Rice, Edwin Wilbur, DD. Entry for 'Abaddon'. People's Dictionary of the Bible. https://www.studylight.org/dictionaries/eng/rpd/a/abaddon.html. 1893.