n 1 a  :  a circular band  b  :  an anatomical structure having a circular opening  :  ANNULUS  2  :  an arrangement of atoms represented in formulas or models in a cyclic manner as a closed chain - called also cycle 
vi, rang  , rung  , ring*ing   :  to have the sensation of being filled with a humming sound <his ears rang>  .
 
 
 
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