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Definition of bittern noun from the Oxford Advanced Learner's Dictionary

bittern

noun
 
/ˈbɪtən/
 
/ˈbɪtərn/
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  1. a European bird of the heron family, that lives on wet ground and has a loud call
    Word Originlate Middle English bitore, from Old French butor, based on Latin butio ‘bittern’ + taurus ‘bull’ (because of its call). The -n was added in the 16th cent., perhaps by association with hern, obsolete variant of heron.
See bittern in the Oxford Advanced American Dictionary
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adverb
 
 
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