The Collaborative International Dictionary of English v.0.48:

Curatrix \Cu*ra"trix\ (-tr?ks), n. [L.]
   1. A woman who cures.
      [1913 Webster]

   2. A woman who is a guardian or custodian. --Burrill.
      [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

CURATRIX. A woman who has been appointed to the office of curator.