The Collaborative International Dictionary of English v.0.48:

Rixatrix \Rix*a"trix\, n. [L.] (Old Eng. Law)
   A scolding or quarrelsome woman; a scold. --Burrill.
   [1913 Webster]

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

RIXATRIX. A common scold. (q.v.)