Liddell-Scott-Jones

περιφέρεια (periphereia) madness ^G:N-F

περιφέρεια-εια,

Ionic dialect περιφερ-είη, ἡ, circumference, κύκλου [Refs 1st c.AD+]; (rounded) surface, σφαίρας [Refs 5th c.BC+]; of helmets, [Refs 4th c.BC+]; more generally, curve, [Refs]; curvature of the edge of a leaf, [Refs 4th c.BC+]; roundness, [Refs 5th c.BC+]; spherical or curved shape, [Refs 4th c.BC+]

__2 arc of a circle, [Refs 4th c.BC+]; marked on concave sun-dial (πόλος), [Refs 3rd c.BC+]
__II wandering, error, ἐν καρδίᾳ [LXX]

_{LSJ Scripture Refs: LXX.Eccl.9.3}