#arch  (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
  supertype:  #physical_structure__structure__construction  a thing constructed; a complex construction or entity; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons"
  subtype:  #abutment_arch  #broken_arch  #camber_arch  #corbel_arch  #flat_arch  #pier_arch  #pointed_arch  #proscenium_arch  #rampant_arch  #round_arch  #rowlock_arch  #safety_arch  #scoinson_arch  #shouldered_arch  #skeen_arch  #skew_arch  #squinch  #trimmer_arch  #triumphal_arch  #Tudor_arch
  part of:  #aqueduct  #arcade.structure  #bridge
  part:  #keystone__headstone  the central building block at the top of an arch or vault
  part:  #springer__impost  the lowest stone in an arch -- from which it springs
  part:  #voussoir  wedge-shaped stone building block used in constructing an arch or vault

No statement uses or specializes #arch; click here to add one.