a person who bleeds abnormally because of low clotting rate; hemophiliac.
a person or animal that bleeds easily, especially an athlete or racehorse.
a person who draws blood from a sick person; phlebotomist.
Slang. a person who drains another of money, resources, etc.; parasite or usurer.
Metallurgy. an ingot or casting from which some metal has escaped.
Also called bleeder resistor. Electricity. a resistor that is connected across a power supply for voltage regulation and to dissipate the charge remaining in capacitors when the power is discontinued.
Also called bleeder valve. a valve or opening for draining a tank, tubing, etc.
British Slang.
a despicable person.
a person, especially a man; fellow.

1780–90; bleed + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bleeder (ˈbliːdə)
1.  slang
 a.  derogatory a despicable person: a rotten bleeder
 b.  any person; fellow: where's the bleeder gone?
2.  pathol a nontechnical name for a haemophiliac

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

bleeder bleed·er (blē'dər)

  1. A person, such as a hemophiliac, who bleeds freely or is subject to frequent hemorrhages.

  2. A blood vessel from which there is uncontrolled bleeding.

  3. A blood vessel severed by trauma or surgery that requires cautery or ligature to arrest the flow of blood.

  4. A person who draws blood from another; a phlebotomist.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The panel was ventilated by a flow-through bleeder system with multiple bleeder
  entries at the rear of the panel.
The panel was ventilated by a flow-through bleeder system that included
  multiple bleeder entries.
Bleeder entries are established around the perimeter of a set of longwall
  panels and are used to control methane liberation.
The operator may elect to show information required for bleeder maps on the
  annual map also.
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