night dial

noun

1

: a dial showing time by the moon's shadow

called also moondial

2

: a clockface made luminous at night by a light from behind or by radioluminescent paint

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