A network of spies.

The branch of mathematics dealing with the algebraic structure of rings.

A decorative ring that is worn in a person's pierced tongue.

Alternative spelling of tree ring

Any of the concentric rings formed in the trunk of a tree by the annual growth of wood

The annual growth ring in the trunk of a tree.

a round metal ring, approximately 1 cm high, used when cooking to prevent an egg spreading across the cooking surface.

(cooking) A circular slice of squid, usually one of several, deep-fried as an antipasto.

plural of ring theorist

(algebra) A commutative ring with a unique maximal ideal, or a noncommutative ring with a unique maximal left ideal or (equivalently) a unique maximal right ideal.