Something that's arched is curved or rounded. An arched doorway has a curve at the top, and an arched eyebrow is raised and curved in surprise or skepticism.

You can use the adjective arched to describe architectural details like arched windows and ceilings: "The long, arched passageways gave the palace a certain elegance." A curving vine across a trellis is arched, and so is the curve at the bottom of your foot. The root of arched is the Old French arche, "arch of a bridge," from Latin arcus, "a bow."

Definitions of arched
  1. adjective
    forming or resembling an arch
    “an arched ceiling”
    synonyms: arced, arching, arciform, arcuate, bowed
    curved, curving
    having or marked by a curve or smoothly rounded bend
  2. adjective
    constructed with or in the form of an arch or arches
    “an arched passageway”
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