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Deimos

American  
[dahy-mos] / ˈdaɪ mɒs /

noun

  1. an ancient Greek personification of terror, a son of Ares and Aphrodite.

  2. Astronomy. one of the two moons of Mars.

Deimos British  
/ ˈdeɪmɒs /

noun

  1. the smaller of the two satellites of Mars and the more distant from the planet. Approximate diameter: 13 km Compare Phobos

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Deimos Scientific  
/ dē′mōs,dā′- /

  1. The satellite of Mars that is second in distance from the planet.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Recently it captured high-resolution images of Deimos, the smaller of the two Martian moons.

From New York Times • May 29, 2023

While the main spacecraft itself will stay in Mars orbit, subsequently performing flybys of Deimos to study that moon from afar, the sample capsule will touch down in an Australian desert in July 2029.

From Scientific American • May 2, 2023

Phobos is about 27 km across on its longest side, and Deimos is 15 km across.

From Scientific American • May 2, 2023

Deimos was probably not a captured asteroid but a chunk of Mars that broke off from the planet at some point in its history.

From Salon • Apr. 28, 2023

But the gods Phobos and Deimos were old friends to her now.

From "Blood of Olympus" by Rick Riordan

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.