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

 

delphinium

 noun
noun
BrE BrE//delˈfɪniəm//
 
; NAmE NAmE//delˈfɪniəm//
 
 
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a tall garden plant with blue or white flowers growing up its stem Word Originmodern Latin, from Greek delphinion ‘larkspur’, from delphin ‘dolphin’ (because of the shape of the spur, thought to resemble a dolphin's back).
See the Oxford Advanced American Dictionary entry: delphinium