Albers Schoenberg disease, also known as osteopetrosis, is a rare genetic disorder characterized by the abnormal hardening of bones. Individuals with this condition experience increased bone density due to the faulty function of osteoclasts, the cells responsible for breaking down old bone tissue. Although there are no direct synonyms for "Albers Schoenberg disease", it is also referred to as "marble bone disease" due to the bone's appearance on medical imaging. Another term used is "brittle bone disease", as the increased density can make bones prone to fractures. These synonyms are often used to describe different manifestations or aspects of the condition and aid in its understanding and communication.