ALGEBRA A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site ring (math.) Another name for an annulus. (math.) A number system in which addition, subtraction, and multiplication are always defined and the associative and distributive laws are valid. Compare with field.    • ALGEBRA (astron.) See planetary ring. Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP