Chaja \Cha"ja\, n. [Native name.] (Zool.) The crested screamer of Brazil ({Palamedea chavaria} syn. {Chauna chavaria}), so called in imitation of its notes; -- called also {chauna}, and {faithful kamichi}. It is often domesticated and is useful in guarding other poultry. See {Kamichi}. [1913 Webster]