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Waldeyer's ring
(anatomy) The ring of lymphoid tissue in the pharynx.
product ring
(mathematics, ring theory) A ring that is the direct product of rings.
Roman ring
A configuration of wormholes where for each individual wormhole the time difference across its mouths is such that it may not allow a closed timelike curve.
ring toss
A game in which rings are thrown onto pegs or posts.
teething ring
An object designed for a baby or toddler to chew during the teething stage
Boolean ring
(algebra) A ring whose multiplicative operation is idempotent.
napkin ring
A ring for holding napkins along with cutlery.
purity ring
A ring (piece of jewellery) representing a Christian religious vow to abstain from sexual intercourse until marriage.
ring stands
plural of ring stand
abdominal ring
(anatomy) Either of the two openings in the abdominal muscle wall allowing the inguinal canal to pass through. / A form of body art wherein jewelry is placed in a cauterized puncture of the umbilicus.
