sprinkler head

noun

: the outlet of a sprinkler system that is usually a valve held closed by a strut having separable parts joined with solder of a predetermined melting point (such as 160°F) that fuses when exposed to fire temperatures and allows the head to open or by a quartz bulb containing a liquid that expands when heated and bursts the bulb

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now