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The Collaborative International Dictionary of English v.0.48 (gcide)

Screamer \Scream"er\ (skr[=e]m"[~e]r), n. (Zool.)
Any one of three species of South American birds constituting
the family {Anhimidae}, and the suborder {Palamedeae}. 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}.
[1913 Webster]

2. Something so remarkable as to provoke a scream, as of joy.
[Slang]
[Webster 1913 Suppl.]

3. An exclamation mark. [Printer's Slang]
[Webster 1913 Suppl.]