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The Collaborative International Dictionary
disherison

disherison \dis*her"i*son\ (d[i^]s*h[e^]r"[i^]z'n), n. [See Disherit.] The act of disheriting, or debarring from inheritance; disinherison.
--Bp. Hall.

Wiktionary
disherison

n. The act of disheriting, or debarring from inheritance.