photovisual magnitude

noun

: the magnitude of a celestial body that is determined by observations with a photographic plate and filter combination giving nearly the same yellow-green sensitivity as the human eye and that is nearly equal to the visual magnitude

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