FluentPlex

ring

/ɹɪŋ/ noun C2
  1. A family of sets that is closed under finite unions and set-theoretic differences.
  2. A family of sets closed under finite union and finite intersection.

Plural rings

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From the library

“Make yourself perfectly at home,” said the green girl, “and if you wish for anything ring the bell.
The Wonderful Wizard of Oz, p. 66 · B2
“They’ve taken his wedding ring!” he gasped.
The Valley of Fear, p. 32 · C1
Master always wore his plain gold wedding ring on the little finger of his left hand.
The Valley of Fear, p. 32 · C1
That ring with the rough nugget on it was above it, and the twisted snake ring on the third finger.
The Valley of Fear, p. 32 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.