adj :  incapable of being reversed: as  a  :  impossible to make run or take place backward < chemical syntheses>   b  of a colloid  :  incapable of undergoing transformation from sol to gel or vice versa  c  of a pathological process  :  of such severity that recovery is impossible < brain damage>  ir*re*vers*ibil*i*ty n pl  -ties  ir*re*vers*ibly adv 
 
 
 
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