Full Idea
Taking reflexivity as constitutive of the meaning of 'part' amounts to regarding identity as a limit case of parthood.
Clarification
'Reflexive' would mean things are parts of themselves
Gist of Idea
If 'part' is reflexive, then identity is a limit case of parthood
Source
Achille Varzi (Mereology [2003], 2.1)
Book Reference
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.5
A Reaction
A nice thought, but it is horribly 'philosophical', and a long way from ordinary usage and common sense (which is, I'm sorry to say, a BAD thing).