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TheOtherDave comments on Excluding the Supernatural - Less Wrong
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How about: Vampires are humanoids that can sustain themselves only by drinking blood? That excludes blood-drinking when done occasionally or as a cultural practice.
If it turned out that there was a rare degenerative illness that prevented sufferers from absorbing nutrition from any source other than blood, would you agree that sufferers of that illness were vampires?
Ack. Okay, I guess I have no choice but to add yet another qualifier. :-)
How about: Vampires are very long-lived humanoids that derive their longevity from drinking blood. I can't think of a mundane example that fits that description. Which I suppose was Phil's original point: the only useful definition of "vampire" is one which excludes everything that could plausibly exist.