The Collaborative International Dictionary of English v.0.48:

crone \crone\ (kr[=o]n), n. [OD. kronie, karonie, an old sheep,
   OF. carogne, F. charogne, carrion (also F. carogne
   ill-natured woman.). See Carrion, and Crony.]
   1. An old ewe. [Obs.] --Tusser.
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   2. An old woman; -- usually in contempt.
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            But still the crone was constant to her note.
                                                  --Dryden.
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   3. An old man; especially, a man who talks and acts like an
      old woman. [R.]
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            The old crone [a negro man] lived in a hovel, . . .
            which his master had given him.       --W. Irving.
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            A few old battered crones of office.  --Beaconsfield.
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WordNet (r) 3.0 (2006):

crone
    n 1: an ugly evil-looking old woman [syn: hag, beldam,
         beldame, witch, crone]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "crone":
   bag, bat, beldam, biddy, dame, dowager, drab, frump, grandam,
   grandmother, granny, hag, old battle-ax, old dame, old girl,
   old granny, old lady, old trot, old wife, old woman, slattern,
   sloven, trot, war-horse, witch