• WordNet 3.6
    • n inheritrix a female heir
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Webster's Revised Unabridged Dictionary
    • n Inheritrix Same as Inheritress.
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Century Dictionary and Cyclopedia
    • n inheritrix Same as inheritress.
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In literature:

Le Noir, the daughter of Christopher Smart, an inheritrix of much of his talent.
"Our Village" by Mary Russell Mitford
You are worthy to be the inheritrix of all I know.
"The Golden Dog" by William Kirby