"Arc" (visual definition)

Cf. verbal definitions e.g.
"An arc is a curve. You can describe the bend of a rainbow as an arc.
In math, an arc is one section of a circle, but in life you can use the word to mean any curved shape, like the arc of a ballerina's arm or the graceful arc of a flowering vine over a trellis.
In the 14th century, arc first meant the movement of the sun in the sky, from the Old French arc, "bow or arch," and the Latin root arcus, also "bow or arch."

https://www.vocabulary.com/dictionary/arc