Definition of iambic adjective from the Oxford Advanced Learner's Dictionary

 

iambic

 adjective
adjective
BrE BrE//aɪˈæmbɪk//
 
; NAmE NAmE//aɪˈæmbɪk//
 
(specialist)
 
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(of rhythm in poetry) in which one weak or short syllable is followed by one strong or long syllable a poem written in iambic pentameters (= in lines of ten syllables, five short and five long) compare trochaic Word Origin mid 16th cent.: from French iambique, via late Latin from Greek iambikos, from iambos ‘iambus, lampoon’, from iaptein ‘attack verbally’ (because the iambic trimeter was first used by Greek satirists).
See the Oxford Advanced American Dictionary entry: iambic