Having a ring or rings; circled or enclosed by something; marked with rings or circular bands.
From ring (Old English hring, possibly from Germanic roots meaning to curl or twist) + -ed (past tense/adjective suffix). The word originally described circular metal bands and expanded to anything ring-shaped.
Tree scientists count 'rings' to figure out a tree's age and climate history—each ring is a year, and thick rings mean good growing years, thin ones mean drought, so a tree's rings are basically a climate diary written in wood.
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