Eridanus

noun

Erid·​a·​nus i-ˈri-də-nəs 

astronomy

: a southern constellation that is visible stretching between the constellations of Orion and Phoenix and that is represented by the figure of a river

How can you tell whether a galaxy is turned on or not? A team of astronomers set out to answer that question by making a series of detailed radio, infrared, optical, and spectroscopic observations of an unusual spiral galaxy in Eridanus.

—Astronomy, August 1990

Word History

First Known Use

1599, in the meaning defined above

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