n 1  :  one that draws blood : esp  :  a person who draws blood for medical reasons  :  BLOODLETTER  2  :  one that gives up blood  a  :  HEMOPHILIAC  b  :  a large blood vessel divided during surgery  c  :  a horse or other animal immunized against some pathogen and regularly bled for the production of serums .
 
 
 
Similar sounding terms:  blad·der 
 
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