Medical Dictionary

reversion

noun re·ver·sion \ri-ˈvər-zhən, -shən\

Medical Definition of REVERSION

1
a :  an act or the process of returning (as to a former condition) b :  a return toward an ancestral type or condition :  reappearance of an ancestral character
2
:  a product of reversion; specifically :  an organism with an atavistic character

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