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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Don·key n.; pl. Donkeys
 1. An ass; or (less frequently) a mule.
 2. A stupid or obstinate fellow; an ass.
 Donkey engine, a small auxiliary engine not used for propelling, but for pumping water into the boilers, raising heavy weights, and like purposes.
 Donkey pump, a steam pump for feeding boilers, extinguishing fire, etc.; -- usually an auxiliary.
 Donkey's eye Bot., the large round seed of the Mucuna pruriens, a tropical leguminous plant.
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From: WordNet (r) 2.0

 donkey pump
      n : a supplementary pump available if needed [syn: auxiliary
           pump]