- an ancient Greek personification of terror, a son of Ares and Aphrodite.
- Astronomy. one of the two moons of Mars.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for deimos
Deimos proved to be, as we had expected, about six miles in diameter.Edison's Conquest of Mars
Garrett Putnam Serviss
We had quickly overtaken and passed Deimos, far within her orbit.Pharaoh's Broker
By the time Deimos had risen in the sky, they were sound asleep.Stand by for Mars!
Have I your permission to contact Deimos for the latest details, sir?
Here is a transcript of the report from Deimos if you care to have it.
- the smaller of the two satellites of Mars and the more distant from the planet. Approximate diameter: 13 kmCompare Phobos
- The satellite of Mars that is second in distance from the planet.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.