Definition of periphractic in English:

periphractic

adjective ˌpɛrɪˈfraktɪk

Geometry

Designating a region of space having one or more internal bounding surfaces (or curves, when the region is two-dimensional) unconnected with the external boundary (e.g. a globe with an internal cavity, or an annulus), so that a closed surface (or curve, when the region is two-dimensional) may be drawn within the region which cannot be contracted to a point without passing out of the region.

Origin

Late 19th century; earliest use found in James Clerk Maxwell (1831–1879), physicist. From German periphraktisch from Hellenistic Greek περίϕρακτος fenced round (recorded in (neuter) noun use, περίϕρακτον enclosure; from ancient Greek περι- + Hellenistic Greek ϕρακτός fenced, protected (from the stem of ancient Greek ϕράσσειν (Attic ϕράττειν) to fence in + -τός, suffix forming verbal adjectives), after περιϕράσσειν to fence, fortify all round) + German -isch; see -ic.

Definition of periphractic in US English:

periphractic

adjectiveˌpɛrɪˈfraktɪk

Geometry

Designating a region of space having one or more internal bounding surfaces (or curves, when the region is two-dimensional) unconnected with the external boundary (e.g. a globe with an internal cavity, or an annulus), so that a closed surface (or curve, when the region is two-dimensional) may be drawn within the region which cannot be contracted to a point without passing out of the region.

Origin

Late 19th century; earliest use found in James Clerk Maxwell (1831–1879), physicist. From German periphraktisch from Hellenistic Greek περίϕρακτος fenced round (recorded in (neuter) noun use, περίϕρακτον enclosure; from ancient Greek περι- + Hellenistic Greek ϕρακτός fenced, protected (from the stem of ancient Greek ϕράσσειν (Attic ϕράττειν) to fence in + -τός, suffix forming verbal adjectives), after περιϕράσσειν to fence, fortify all round) + German -isch; see -ic.

单词	periphractic
释义	Definition of periphractic in English: periphractic adjective ˌpɛrɪˈfraktɪk Geometry Designating a region of space having one or more internal bounding surfaces (or curves, when the region is two-dimensional) unconnected with the external boundary (e.g. a globe with an internal cavity, or an annulus), so that a closed surface (or curve, when the region is two-dimensional) may be drawn within the region which cannot be contracted to a point without passing out of the region. Origin Late 19th century; earliest use found in James Clerk Maxwell (1831–1879), physicist. From German periphraktisch from Hellenistic Greek περίϕρακτος fenced round (recorded in (neuter) noun use, περίϕρακτον enclosure; from ancient Greek περι- + Hellenistic Greek ϕρακτός fenced, protected (from the stem of ancient Greek ϕράσσειν (Attic ϕράττειν) to fence in + -τός, suffix forming verbal adjectives), after περιϕράσσειν to fence, fortify all round) + German -isch; see -ic. Definition of periphractic in US English: periphractic adjectiveˌpɛrɪˈfraktɪk Geometry Designating a region of space having one or more internal bounding surfaces (or curves, when the region is two-dimensional) unconnected with the external boundary (e.g. a globe with an internal cavity, or an annulus), so that a closed surface (or curve, when the region is two-dimensional) may be drawn within the region which cannot be contracted to a point without passing out of the region. Origin Late 19th century; earliest use found in James Clerk Maxwell (1831–1879), physicist. From German periphraktisch from Hellenistic Greek περίϕρακτος fenced round (recorded in (neuter) noun use, περίϕρακτον enclosure; from ancient Greek περι- + Hellenistic Greek ϕρακτός fenced, protected (from the stem of ancient Greek ϕράσσειν (Attic ϕράττειν) to fence in + -τός, suffix forming verbal adjectives), after περιϕράσσειν to fence, fortify all round) + German -isch; see -ic.
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