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Webster 1913 Edition

Adj.

Made with an arch or curve; covered with an arch;

as, an

arched

door

pp.

Made with an arch or curve; covered with an arch.

arched

Curved.
His arched back ached from the constant strain.
- 1992, Rudolf M. Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, page 7
  The lobule margins, furthermore, are arched away from the lobe, with the consequence that (when fully inflated) the abaxial leaf surface forms the interior lining of the lobule.

arched

simple past tense and past participle of arch (to curve)
To have made curved.
He arched his back into a half-moon curve trying to get the stiffness out.