An Etymological Dictionary of Astronomy and Astrophysics

1. A person who responds or makes reply.
   

2. Law: A defendant, especially in appellate and divorce proceedings (Dictionary.com).

Etymology (EN): Agent noun related to → respondence.

Etymology (PE): Pâsoxgu, from pâsox, → responce, + gu “speaker, teller,” from goftan “to tell, speak, talk,” → -logy.