(anatomy) The upper opening of the inguinal canal.

(algebra, ring theory) A ring in which every non-zero, non-unit (i.e., proper) element can be factored into a product of prime elements (not necessarily distinct), such that such factorization is unique up to permutation of the factors and the replacing of primes by their associate primes.

(algebra, ring theory) A commutative ring in which every ideal is a principal ideal.

Larus delawarensis, a medium-sized gull of temperate North America.

(slang, vulgar) To vomit violently.

A type of hitch also known as the ringbolt hitching.

plural of alternate ring hitching

(gambling, slang) A compulsion to gamble regardless of one's losses.

(algebra) A module (over some ring) with an additional binary operation, a module-element-valued product between module elements, which is bilinear over module addition and scalar multiplication. (N.B.: such bilinearity implies distributivity of the module multiplication with respect to the module addition, which means that such a module is also a ring.)

The Asian butterfly Hestina assimilis, family Nymphalidae, having a row of red spots on each hindwing.