exheredate

from The Collaborative International Dictionary of English v.0.48

Exheredate \Ex*her"e*date\, v. t. [L., exheredatus, p. p. of
   exheredare to disinherit; ex out + heres, heredis, heir.]
   To disinherit. [R.] --Huloet.
   [1913 Webster]