Source : Webster's Revised Unabridged Dictionary (1913)

Abnormity \Ab*nor"mi*ty\, n.; pl. {Abnormities}. [LL.
   abnormitas. See {Abnormous}.]
   Departure from the ordinary type; irregularity; monstrosity.
   ``An abnormity . . . like a calf born with two heads.''
   --Mrs. Whitney.