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[uh-las-ter, ‐tawr] /əˈlæs tər, ‐tɔr/
(sometimes initial capital letter) an avenging spirit or deity frequently evoked in Greek tragedy; a male Nemesis. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for alastor
in Gk. tradition, son of Neleus, brother of Nestor, slain by Herakles. The name is lit. "not to forget," from priv. prefix a- "not" + root of lathein "to forget" (see Lethe), which is why it is often used figuratively in sense of "an avenging spirit."
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for alastor


any of certain avenging deities or spirits, especially in Greek antiquity. The term is associated with Nemesis, the goddess of divine retribution who signified the gods' disapproval of human presumption. Percy Bysshe Shelley's poem Alastor; or, The Spirit of Solitude (1816) was a visionary work in which he warned idealists (like himself) not to abandon "sweet human love" and social improvement for the vain pursuit of evanescent dreams. It describes the early wanderings of such an idealist, his search for ideal love, and his eventual lonely death.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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