sprinkler system

n.
A fire-extinguishing system consisting of a network of overhead pipes that release water automatically when a predetermined temperature has been reached.

A system (usually automatic) for protection against fire which, when activated, sprays water over a large area in a systematic pattern; an integrated system of overhead and underground piping, designed in accordance with fire protection engineering standards, which includes: (a) one or more automatic water supplies, (b) a network of specially sized or hydraulically designed piping which is installed (generally overhead) throughout the building or area, (c) sprinklers (i.e., sprinkler heads) distributed in a systematic pattern which are attached to the piping, (d) a valve which controls each system riser or its supply piping, and (e) a device for actuating an alarm when the system is in operation.

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The noun has one meaning:

Meaning #1: a system for extinguishing fires; water from a network of overhead pipes is released through nozzles that open automatically with the rise in temperature

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sprinkler system