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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

It will also observe the planet's other moon, Deimos, although it will not land on it.

From Barron's ● Oct. 19, 2026

Either a space rock smashed into Mars early in its history, and Phobos and Deimos were created from the debris.

From BBC ● Oct. 18, 2026

The research is the first scientific study to incorporate observations collected during Hera's flyby of 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

‘This is the temple of my brothers, Deimos and Phobos.’

From "Blood of Olympus" by Rick Riordan

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