The Collaborative International Dictionary
Exheredate
Exheredate \Ex*her"e*date\, v. t. [L., exheredatus, p. p. of
exheredare to disinherit; ex out + heres, heredis, heir.]
To disinherit. [R.]
--Huloet.
Wiktionary
exheredate
vb. To disinherit.