Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • proper n. A son of Ares (Mars). Also the Greek god of fear.
  • proper n. The innermost natural satellite of Mars.

from The Century Dictionary and Cyclopedia

  • n. The inner of the two satellites of the planet Mars, discovered by Asaph Hall at Washington, in August, 1877.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the larger of the two satellites of Mars

Etymologies

Greek, fear, deity who personifies fear, from phobos, fear; see -phobe.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek φόβος (phobos, "fear"). (Wiktionary)

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