Definition of arch noun from the Oxford Advanced American Dictionary

     

    arch

     noun
    noun
    NAmE//ɑrtʃ//
     
     
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  1. 1a curved structure that supports the weight of something above it, such as a bridge or the upper part of a building a bridge with three arches
  2. 2 a structure with a curved top that is supported by straight sides, sometimes forming an entrance or built as a monument Go through the arch and follow the path. The Gateway Arch is a famous St. Louis landmark.
  3. 3the raised part of the foot formed by a curved section of bones
  4. 4anything that forms a curved shape at the top the delicate arch of her eyebrows
See the Oxford Advanced Learner's Dictionary entry: arch