astrograph

noun

as·​tro·​graph

ˈastrōˌgraf

plural -s

1

: a photographic telescope designed for use in mapping the heavens

2

: a now little used navigational instrument for projecting star-altitude curves from film directly onto a Mercator chart of proper scale

Word History

Etymology

International Scientific Vocabulary astr- + -graph

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