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Full Idea
We might find out that tigers had none of the properties by which we originally identified them.
Gist of Idea
Tigers may lack all the properties we originally used to identify them
Source
Saul A. Kripke (Naming and Necessity lectures [1970], Lecture 3)
Book Ref
Kripke,Saul: 'Naming and Necessity' [Blackwell 1980], p.121
A Reaction
This sounds like a can of worms. If I baptise someone 'the tallest man in the room', and it turns out he isn't, I withdraw my baptism. Why would I never withdraw 'tiger'? I suppose Kripke is right.