noun
: concrete in which the usually rock aggregates are partially or wholly replaced by aggregates of metal (as steel) and which is used especially for counterweights or in shielding nuclear reactors
noun
: concrete in which the usually rock aggregates are partially or wholly replaced by aggregates of metal (as steel) and which is used especially for counterweights or in shielding nuclear reactors
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012