A female executor; a woman legally appointed to execute the terms of a will and manage an estate.
From executor (from Latin executor) plus -trix (feminine suffix from Latin). This Latinate form was standard in legal English throughout the 19th and 20th centuries.
In old legal documents, 'executrix' was mandatory when naming a woman—now courts increasingly accept 'executor' for everyone, but you'll see 'executrix' in hundreds of thousands of historical wills and legal records.
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