Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • proper n. An extinct volcano and prominent feature on the planet Mars, notable as the highest mountain in the solar system (elevation: 27 kilometers).

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Named in 1973 after the albedo feature Nix Olympica ("Snows of Olympus").

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