The Collaborative International Dictionary of English v.0.48:

Harridan \Har"ri*dan\ (h[a^]r"r[i^]*dan), n. [F. haridelle a
   worn-out horse, jade.]
   A worn-out strumpet; a vixenish woman; a hag.
   [1913 Webster]

         Such a weak, watery, wicked old harridan, substituted
         for the pretty creature I had been used to see. --De
                                                  Quincey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

harridan
    n 1: a scolding (even vicious) old woman

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "harridan":
   Jezebel, baboon, bad woman, bag, baggage, bitch, blemish, blot,
   broad, chippy, clitoromaniac, cocotte, dog, drab, easy lay,
   easy woman, eyesore, floozy, frail sister, fright, gargoyle,
   grisette, hag, hussy, hysteromaniac, jade, loose woman, mess,
   monster, monstrosity, no beauty, nymphet, nympho, nymphomaniac,
   pickup, quean, scarecrow, sight, slut, strumpet, tart, teratism,
   trollop, trull, ugly duckling, uteromaniac, wanton, wench, whore,
   witch