Definition of "air horn" []

• A pneumatic horn (noun)
• Air intake of a carburetor (noun)

WordNet. Princeton University. 2010.

• "Much of the earlier research on violent video games involved artificial situations, such as having college sophomores play a new game for a few minutes in a research laboratory, or measuring fraction-of-a-second differences in how long someone blasts an air horn or triggers white noise from a computer a surrogate, the researchers claim, for aggression or for violent behavior after playing a violent game."