Any one of three species of South American birds constituting the family Anhimidæ, and the suborder Palamedeæ. They have two spines on each wing, and the head is either crested or horned. They are easily tamed, and then serve as guardians for other poultry. The crested screamers, or chajas, belong to the genus Chauna. The horned screamer, or kamichi, is Palamedea cornuta.
- One that screams, especially one that sings harshly or stridently.
- Slang A sensational headline.
- Slang One that evokes screams or laughter: The comedian's act is a real screamer.
- Slang An exclamation point.
- Baseball A hard-hit line drive.
- Any of several large aquatic birds of the family Anhimidae, of South America, that have a harsh resonant call.