Source : Webster's Revised Unabridged Dictionary (1913)

Biddy \Bid"dy\, n. [Etymology uncertain.]
   A name used in calling a hen or chicken. --Shak.

Biddy \Bid"dy\, n. [A familiar form of Bridget.]
   An Irish serving woman or girl. [Colloq.]

Source : WordNet®

biddy
     n 1: adult female chicken [syn: {hen}]
     2: young bird especially of domestic fowl [syn: {chick}]