#aqueduct  a conduit that resembles a bridge but carries water over a valley
  supertype:  conduit__channel  a passage for water (or other fluids)
  part:  arch  (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
     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

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