Definition of fire alarms:
(n) :
An electromechanical or electronic bell, klaxon, chime, horn, speaker, strobe light or other device which warns people in a building etc. of a possible fire or other condition requiring evacuation.
(n) :
The sound or other warning made by a fire alarm.
(n) :
(firefighting) An emergency response to a fire by the fire department with manpower and equipment.