periphraxyGeom.|ˈpɛrɪfræksɪ| [f. late Gr. περίϕραξ-ις a fencing round: see periphractic.] The condition of being periphractic. 1881[see periphractic].1895H. Lamb Hydrodynamics 70 For spaces of two dimensions, periphraxy and multiple-connectivity become the same thing.