Definitions

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

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

from The Century Dictionary and Cyclopedia

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

Etymologies

Greek alastōr, from alastos, unforgettable : a-, not; see a-1 + lanthanein, lath-, to escape notice.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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