Etymology
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bloodsucker (n.)

also blood-sucker, late 14c., of animals (leeches, mosquitoes, etc.), from blood (n.) + sucker (n.); in the figurative sense, of persons, it is attested from 1660s. Related: Bloodsucking.

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Definitions of bloodsucker

bloodsucker (n.)
carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end;
Synonyms: leech / hirudinean
From wordnet.princeton.edu