The Collaborative International Dictionary of English v.0.48:

Psittaceous \Psit*ta"ceous\, Psittacid \Psit"ta*cid\, a. [L.
   psittacus a parrot, Gr. ?: cf. F. psittacide.] (Zool.)
   Of or pertaining to the parrots, or the Psittaci. -- n. One
   of the Psittaci.
   [1913 Webster]