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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.