A ring (often ornamental and/or precious) designed to be worn on a finger.

(UK) the woodpigeon, Columba palumbus. / (UK) the collared dove, Streptopelia decaocto.

A ring (piece of jewellery) containing a thermochromic element that changes colour in response to the body temperature, and supposedly the emotional state, of its wearer.

plural of ring topology

(algebra) Given ring R with identity not equal to zero, and group G=g_1,g_2,...,g_n, the group ring RG has elements of the form a_1g_1+a_2g_2+...+a_ng_n (where a_i isin R) such that the sum of a_1g_1+a_2g_2+...+a_ng_n and b_1g_1+b_2g_2+...+b_ng_n is (a_1+b_1)g_1+(a_2+b_2)g_2+...+(a_n+b_n)g_n and the product is ∑ₖ₌₁ⁿ(∑_(g_ig_j=g_k)a_ib_j)g_k.

To make patterned sound sequences on bells, starting and ending on the same tone. / To run through all possible variations. / (slang, UK, 19th century and earlier) To pass counterfeit money.

(slang, sexology) A band, worn around the base of the penis, used to slow down the flow of blood from the penile tissue and hence maintain an erection.

Having to do with ring theory.

Having to do with ring theory.

(firearms) A small metal ring on the side of a firearm, allowing it to be hung on a saddle hook or attached to a lanyard.