Adm'x

Noun

administratrix (plural administratrices or administratrixes)

1. A female administrator.
   • The Princess Sophia was named in the act of settlement […] not for her merits as a temporary administratrix of a power, which she might not, and in fact did not, herself ever exercise.1790, Edmund Burke, Reflections on the Revolution in France, Oxford, published 2009, page 24

   Synonyms:

   administratress, administress