'amphrysian' originates from the Greek word 'Amphrysos,' referring to a river in Thessaly, Greece, associated with the god Apollo.

'Amphrysos' was used in ancient Greek texts to denote the river, and the term 'amphrysian' evolved to describe things related to this river.

Initially, it referred specifically to the river, but over time it evolved to describe anything related to the river or its divine associations.