iamb

from WordNet (r) 3.0 (2006)
iamb
    n 1: a metrical unit with unstressed-stressed syllables [syn:
         {iamb}, {iambus}]
    
from The Collaborative International Dictionary of English v.0.48
Iamb \I"amb\, n. [Cf. F. iambe. See {Lambus}.]
   An iambus or iambic. [R.]
   [1913 Webster]
    

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