vampirism

from WordNet (r) 3.0 (2006)

vampirism
    n 1: belief in the existence of vampires
    2: the actions or practices of a vampire

from The Collaborative International Dictionary of English v.0.48

Vampirism \Vam"pir*ism\, n. [Cf. F. vampirisme.]
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   1. Belief in the existence of vampires.
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   2. The actions of a vampire; the practice of bloodsucking.
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   3. Fig.: The practice of extortion. --Carlyle.
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