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

 

bittern

 noun
noun
BrE BrE//ˈbɪtən//
 
; NAmE NAmE//ˈbɪtərn//
 
 
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a European bird of the heron family, that lives on wet ground and has a loud call Word Origin late 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 the Oxford Advanced American Dictionary entry: bittern