Ιve looked all over for a definition of this. I think it's a compound of λυω + δια in the weak aorist active but I can't find an exact meaning. Here is the context:
"χειμὼν μέγιστος διέλυσε τὰς γεφυρας" Simplified Herodotus - 'Xerxes whips the sea'
Please help!