large concrete or cement masonry units for building
Concrete masonry unit Those that use cinders (fly ash or bottom ash) are called cinder blocks in North America, breeze blocks (breeze is a synonym of ash)[1] in the United Kingdom, and hollow blocks in the Philippines. In New Zealand they are known as concrete blocks or more commonly as just blocks. In Australia they are also known as Besser blocks or Besser bricks, because the American-based Besser Company was a major supplier of concrete-block-making machinery. Clinker blocks use clinker as aggregate. In non-technical usage, the terms cinder block and breeze block are often generalized to cover all of these varieties.