Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The satellite of Mars second in distance from the planet.

from The Century Dictionary.

  • noun A satellite of Mars, revolving about its primary in 30 hours and 18 minutes. It was discovered by Asaph Hall, of Washington, in 1877.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun mythology A son of Ares (Latin: Mars).
  • proper noun astronomy The outermost natural satellite of Mars.

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

  • noun the outer of two small satellites of Mars

Etymologies

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

[Greek, one of Ares' sons, from deimos, fear, terror.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek Δεῖμος (Deimos), from δειμός (deimos, "fear").

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