Having a colored ring or rings around the neck; said of animal species.

having a tail marked with differently colored rings / carrying its flexible tail in a circular or spiraling form

A ring given to one's fiancé(e) or intended fiancé(e), signifying a promise to wed, typically a gold band with one or more diamonds or other precious stones.

(geology, volcanology) An area of frequent earthquakes and volcanic activity, around the Pacific Ocean.

(card games) A drinking game in which each card of a pack of playing cards, picked at random from a deck sprawled out in a circle, has a certain consequence (involving drinking, or playing a particular drinking game).

(medicine) A stainless steel ring sutured to the sclera to support the globe during difficult eye operations.

Having to do with ring theory.

plural of ring finger

(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.