submarine bell

noun

: an underwater sound transmitting device using the strokes of a bell to send messages or to send at stated intervals a signal as an aid to navigation in a fog

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