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:

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