coheir

from The Collaborative International Dictionary of English v.0.48
Coheir \Co*heir\, n.
   A joint heir; one of two or more heirs; one of several
   entitled to an inheritance.
   [1913 Webster]
    
from Bouvier's Law Dictionary, Revised 6th Ed (1856)
CO-HEIR. One of several men among whom an inheritance is to be divided. 
    

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