NoDictionaries   Text notes for  
... Ortygie; timuit concursibus Argo undarum sparsas Symplegadas elisarum, quae...

'undarum' : 'undarum elisarum' = of the splashing waves - this combination goes with 'concursibus' in the previous vs: the Argo feared because of the collision of the splashing waves the scattered Symplegades.