alarmer

noun
alarm·er | \ ə-ˈlär-mər \

Definition of alarmer 

: an occurrence (such as a building fire) that triggers a specified number of alarms used in combination It took 2¹/₂ hours to put out the fire, a four-alarmer that drew scores of firefighters from neighboring communities. —Ron Devlin, Morning Call (Allentown, Pennsylvania), 5 Oct. 2005

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First Known Use of alarmer

1935, in the meaning defined above

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The first known use of alarmer was in 1935

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