vam·pire 
(vămpīr′)
(vămpīr′)n.
1. In popular folklore, an undead being in human form that survives by sucking the blood of living people, especially at night.
2. A person, such as an extortionist, who takes advantage of others, especially for personal gain.
3. A vampire bat.
[French, from German Vampir, of Slavic origin.]
vam·piric (văm-pĭrĭk), vam·piri·cal (-ĭ-kəl), vampir′ish (-ĭsh) adj.