Webster's English Dictionary

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vampire

vam.pire \'vam-.pi-(-*)r\ n [F, fr. G vampir, of Slav origin; akin to Serb 
   vampir vampire] 1: the body of a dead person believed to come from the 
   grave at night and s uck the blood of persons asleep 2a: one who lives by 
   preying on others  2b: a woman who exploits and ruins her lover  3: any of 
   various bats reputed to feed on blood : as  3a: any of several large So. 
   and Central American insectivorous bats  3b: any of various So. American 
   bats (genera Desmodus and Diphylla  of the family Desmodontidae) 
   structurally adapted for subsisting on blood and dangerous to man and 
   domestic animals esp. as vectors of equine trypanosomiasis and of rabies 
   3c: a large insectivorous or frugivorous Old World bat (as a fruit bat)