Deimos

American

[dahy-mos] / ˈdaɪ mɒs /

noun

an ancient Greek personification of terror, a son of Ares and Aphrodite.
Astronomy. one of the two moons of Mars.

Deimos British

/ ˈdeɪmɒs /

noun

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′- /

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

Example Sentences

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Deimos

"But that doesn't necessarily mean that Deimos is actually an asteroid. It could also have formed from material ejected during impacts on Mars."

From Science Daily ● Aug. 26, 2026

The research, published in Nature Astronomy, is the first scientific publication to use observations gathered when ESA's Hera spacecraft flew past Deimos.

From Science Daily ● Aug. 26, 2026

That porous structure would have absorbed and weakened some of the energy from the collision, helping Deimos survive the impact.

From Science Daily ● Aug. 26, 2026

Deimos is the smaller and more distant of Mars' two moons.

From Science Daily ● Aug. 26, 2026

We find them throughout the inner solar system—from Mercury, closest to the Sun, to cloud-covered Venus to Mars and its tiny moons, Phobos and Deimos.

From "Cosmos" by Carl Sagan

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