bargu -bag- gismu

x₁ arches/curves over/around x₂ and is made of x₃; x₁ is an arch over/around x₂ of material x₃.

Also arc; x₂ need not be an object, but may be a point or volume. See also cripu, kruvi, korcu, condi.

In notes:

condi: x₁ is deep in extent in direction/property x₂ away from reference point x₃ by standard x₄.
cripu: x₁ is a bridge/span over/across x₂ between x₃ and x₄ [unordered, typically destination first].
korcu: (adjective:) x₁ is bent/crooked/not straight or direct/[twisted]/folded.
kruvi: x₁ is a curve/turn/bend in x₂, at locus x₃, and defined by set of points/properties x₄.
bagyce'a: c₁=b₁ is a bow that shoots arrow c₂ from string c₃, and is made of material b₃.
selbargu: x₂=b₁ arches/curves over/around x₁=b₂ and is made of x₃=b₃; x₂=b₁ is an arch over/around x₁=b₂ of material x₃=b₃.
terbargu: x₃=b₁ arches/curves over/around x₂=b₂ and is made of x₁=b₃; x₃=b₁ is an arch over/around x₂=b₂ of material x₁=b₃.
arkada: x₁ is an arcade (a structure composed of a series of arches supported by columns)