1) A disease of animals, especially of horses, often linked with glanders. It produced mucus in the nasal passages and swellings under the jaw.
1533 That no man put eny farcy horses ... of the common, Selby
1648 tyed a bag of foxdocks in my horses tayle for the farsey, Thurlstone
1664 noe person … shall put any scabbed or farcie horses upon the comens, Earlsheaton. In Henry Best’s Memorandum Book is an undated remedy: c.1625 A drink for the fayrsy. Take a quart of old ale, the juice of a handful of rue. Boil them together and when it hath boiled well take it off and after it be but lukewarm give the horse it to drink. And then put a little aquavitae and a little of the juice of rue into the horse’s ears with a little wool and twich them up sure, Elmswell.