"old woman," 1785, from Biddy, pet form of common Irish fem. proper name Bridget. The meaning "Irish female domestic servant" (1861) is American English.
Entries linking to biddy
Bridget
fem. proper name, from Irish Brighid, name of a goddess associated with fire, spring, fertility, healing, poetry and smithcraft, from brigh "strength," from Celtic *brig-o-, from PIE *bhrgh-nt- "high, mighty," from root *bhergh- (2) "high."