Phobos

American

[foh-buhs, -bos] / ˈfoʊ bəs, -bɒs /

noun

Classical Mythology. Also Phobus a son and attendant of Ares and the personification of a fear held to possess armies and cause their defeat.
Astronomy. one of the two moons of Mars.

Phobos British

/ ˈfəʊbɒs /

noun

the larger of the two satellites of Mars and the closer to the planet. Approximate diameter (although it has an irregular shape): 23 km Compare Deimos

"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

Phobos Scientific

/ fō′bəs /

The larger and inner of the two planetary satellites of Mars.

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.

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

From Science Daily • May 11, 2026

Scientists aren’t sure whether Phobos and Deimos are former asteroids that Mars captured into orbit with its gravity or if they formed out of debris that was already in orbit around Mars.

From Salon • Dec. 29, 2023

The spacecraft will spend three years around Mars conducting science operations to observe Phobos and Deimos.

From Salon • Dec. 29, 2023

Many industry experts note that even before the latest Western sanctions, the use of substandard components led to the collapse of an ambitious mission to send a probe to Mars’ moon Phobos in 2011.

From Seattle Times • Aug. 22, 2023

So once again I am the desert wanderer, using Phobos to navigate and hoping I don't stray too far.

From "The Martian" by Andy Weir

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