fairy ring
n.— «Evidence of logging is best visualized by the way redwoods grow in rings, sometimes referred to as “fairy rings.” These are caused by the resprouts that grow around a stump. You can get a sense of how big the original tree was by measuring the inside of the fairy ring.» —“Redwood’s amazing biology makes them survivors” by Joe Rigney Santa Cruz Sentinel (California) July 22, 2004. (source: Double-Tongued Dictionary)
Further reading
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Ever wonder what medieval England looked and sounded like? In Old English, the word hord meant “treasure” and your wordhord was the treasure of words locked up inside you. A delightful new book uses the language of that period to create...