Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An avenging deity or spirit, the masculine personification of Nemesis, frequently evoked in Greek tragedy.

from The Century Dictionary.

  • noun A relentless avenging spirit; a nemesis.
  • noun [capitalized] A genus of bats from the Upper Eocene phosphorites of France.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek alastōr, from alastos, unforgettable : a-, not; see a– + lanthanein, lath-, to escape notice.]

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