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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 passenger pigeon Zool., A once common wild pigeon of North America (Ectopistes migratorius), now extinct.  It was so called on account of its extensive migrations.
 

From: WordNet (r) 2.0

 passenger pigeon
      n : gregarious North American migratory pigeon now extinct [syn:
           Ectopistes migratorius]