or  di*a*ste*reo*iso*mer  n :  an isomer that is a stereoisomer of a compound having two or more chiral centers and that is not a mirror image of another stereoisomer of the same compound di*a*ste*reo*mer*ic or  di*a*ste*reo*iso*mer*ic  adj di*a*ste*reo*isom*er*ism n 
 
   
 
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