interstellar line

noun

: one of the dark spectral lines of a star or other distant celestial body that is caused by the absorption of atoms and molecules in the intervening interstellar gas and that does not partake of the Doppler shift of the spectral lines produced in the star itself

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