from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Describing motion in a forward direction, especially with respect to other bodies in the same system
  • adj. Describing a metamorphic change resulting from a higher pressure or temperature


Sorry, no etymologies found.



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  • The direction of orbit is known for roughly a dozen exoplanets (planets outside our solar system). This is the only example with a retrograde orbit. All others are prograde; they orbit in the same direction as the spin of their star.

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