I am not aware of a specific medical definition for "Myntsamling" as it is not a term commonly used in medical literature or practice. However, if we break down the two words - "mynt" meaning coin and "samling" meaning collection, it could be interpreted as a "coin collection."

If you are referring to a situation where an individual hoards or collects objects, including coins, to the point of compulsive behavior that may interfere with their daily life, then it might be related to a medical condition known as "hoarding disorder." Hoarding disorder is recognized in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) as a distinct mental health diagnosis. It is characterized by persistent difficulty discarding or parting with possessions, regardless of their actual value, due to a perceived need to save them. This behavior results in the accumulation of a large number of possessions that clutter and congest living spaces and compromise their intended use.

If you could provide more context or clarify your question, I would be happy to help further!