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Meaning of Poynting-Robertson effect

Poyn'ting-Rob'ert•son effect"

Pronunciation: (poin'ting-rob'urt-sun), [key]
— Astron. Astron.
  1. the slowing down and consequent spiraling inward of small particles orbiting the sun, due to their interaction with solar radiation.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.