Strong's G5020 · Greek

ταρταρόω

tartaroo · tar-tar-o'-o

from Tartaros (the deepest abyss of Hades); to incarcerate in eternal torment

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 1 *† ταρταρόω , -ῶ ( Τάρταρος , a Greek name for the underworld, esp. the abode of the damned), to cast into hell : II Pe 2:4 (v. Mayor, in l.).† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain