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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Blue·bill n. Zool. A duck of the genus Fuligula.  Two American species (Fuligula marila and Fuligula affinis) are common. See Scaup duck.
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From: WordNet (r) 2.0

 bluebill
      n : diving ducks of North America having a bluish-gray bill
          [syn: scaup, scaup duck, broadbill]