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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

Researchers believe micrometeorites striking Mars' moons, Phobos and Deimos, may throw dust particles into space.

From Science Daily ● May 11, 2026

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

From New York Times ● May 29, 2023

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

From Scientific American ● May 2, 2023

During a fly-by mission of Deimos on March 10, the Hope mission team scanned the planet's surface using instruments that detected light waves ranging from the infrared to the extreme ultraviolet, according to Nature.

From Salon ● Apr. 28, 2023

The information I have suggests that Deimos and Phobos look somewhat similar to Earth’s moon, though they are much smaller in size.

From "A Rover's Story" by Jasmine Warga

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