bittern

Từ điển WordNet v3.1 - WordNet Dictionary

noun

relatively small compact tawny-brown heron with nocturnal habits and a booming cry;
found in marshes
• Hypernyms:
heron
• Hyponyms:
American bittern, stake driver, Botaurus lentiginosus, European bittern, Botaurus stellaris,
least bittern, Ixobrychus exilis