Full Idea
Definite descriptions pick out different objects in different possible worlds quite naturally.
Gist of Idea
Definite descriptions pick out different objects in different possible worlds
Source
Melvin Fitting (Intensional Logic [2007], 3.4)
Book Reference
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.16
A Reaction
A definite description can pick out the same object in another possible world, or a very similar one, or an object which has almost nothing in common with the others.