adjective/pa.nik/
pertaining to the god Pan; panicked; sudden, violent, and mostly baseless
“peur panique” — strong fear, terror
Inherited from Middle French panique, a learned borrowing from Ancient Greek πανικός (panikós), from Πάν (Pán). Pan, the Greek god of fields and woods, was believed to be the source of mysterious sounds that caused contagious, groundless fear in herds and crowds, or in people in lonely spots.