Meaning of fairy ring

fair'y ring"

Pronunciation: [key]
  1. any of numerous mushrooms of meadows and open woods, esp. the well-known Marasmius oreades, that spread in rings originating from mycelial growth: formerly supposed to mark the paths laid by dancing fairies.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.