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

 

iambus

 noun
noun
BrE BrE//aɪˈæmbəs//
 
; NAmE NAmE//aɪˈæmbəs//
 
(pl. iambi
BrE BrE//aɪˈæmbaɪ//
 
; NAmE NAmE//aɪˈæmbaɪ//
 
, iambuses)
(also iamb
BrE BrE//ˈaɪæm//
 
; NAmE NAmE//ˈaɪæm//
 
; BrE BrE//ˈaɪæmb//
 
; NAmE NAmE//ˈaɪæmb//
 
)
(specialist) Poetry
 
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a unit of sound in poetry consisting of one weak or short syllable followed by one strong or long syllable See related entries: Poetry Word Origin late 16th cent.: Latin, from Greek iambos ‘iambus, lampoon’, from iaptein ‘attack verbally’ (because the iambic trimeter was first used by Greek satirists).
See the Oxford Advanced American Dictionary entry: iambus