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Abaddon

Ἓν οἶδα, ὅτι οὐδὲν οἶδα –> I know only one thing, that I know nothing | all I know is that I know nothing.
Diogenes Laertius, Lives of the Philosophers, Book 2 sec. 32.

Latin > English (Lewis & Short)

Abaddon: ,m. indecl. Heb. destruction,
I the name of the angel of Tartarus, Vulg. Apoc. 9, 11.