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

 

haiku

 noun
noun
BrE BrE//ˈhaɪkuː//
 
; NAmE NAmE//ˈhaɪkuː//
 
(pl. haiku, haikus)(from Japanese) Poetry
 
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a poem with three lines and usually 17 syllables, written in a style that is traditional in Japan See related entries: Poetry Word OriginJapanese, contracted form of haikai no ku ‘light verse’.
See the Oxford Advanced American Dictionary entry: haiku