#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:  #keystone  #springer  #voussoir
  part of:  #aqueduct  a conduit that resembles a bridge but carries water over a valley
  part of:  #arcade.structure__colonnade  a structure composed of a series of arches supported by columns
  part of:  #bridge__span  a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.
     part of:  #transportation_system__transportation__transit  facility consisting of the roads and equipment necessary for the movement of passengers or goods
        part of:  #infrastructure__base  the stock of basic facilities and capital equipment needed for the functioning of a country or area; "the industrial base of Japan"

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