What is "abnormity"

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.

n. 1 (context rare English) (alternate form of abnormality English) (First attested in the mid 18^th century.)(R:SOED5: page=6) 2 A monstrosity (First attested in the mid 19^th century.)