noun.
A female administrator. Often contracted to admx.
the GNU version of the Collaborative International Dictionary of English
noun.
A woman who administers; esp., one who administers the estate of an intestate, or to whom letters of administration have been granted; a female administrator.
"Nonetheless, the court appointed her special administratrix of the Monroe estate, most likely due to the influence of Joe DiMaggio, who by many accounts had been planning to remarry Marilyn."