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Noun bittern has 1 sense
  1. bittern - relatively small compact tawny-brown heron with nocturnal habits and a booming cry; found in marshes
    --1 is a kind of     heron
    --1 has particulars:
     American bittern, stake driver, Botaurus lentiginosus; European bittern, Botaurus stellaris; least bittern, Ixobrychus exilis
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