#barrier  a structure or object that impedes free movement
  supertype:  obstructor__obstruction__obstructer__impediment__impedimenta  any structure that makes progress difficult
  subtype:  bannister__banister__balustrade__balusters__baluster__handrail  a railing at the side of a staircase or balcony to prevent people from falling
  subtype:  barricade  a barrier (usually thrown up hastily so as to impede the advance of an enemy); "they enemy stormed the barricade"
  subtype:  breakwater__groin__groyne__mole__bulwark__seawall__jetty  a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
  subtype:  bulwarks__bulwark  a fence-like structure around a deck
  subtype:  dike__dam__dyke__levee  a barrier constructed to contain the flow or water or to keep out the sea
     subtype:  Aswan_High_Dam__Aswan_Dam__High_Dam  one of the world's largest dams on the Nile River in southern Egypt
     subtype:  Hoover_Dam  a large dam on the Colorado River in Nevada
     subtype:  milldam  dam to make a millpond to provide power for a water mill
     subtype:  weir  a low dam built across a stream to raise its level or divert its flow
  subtype:  fencing__fence  a barrier that serves to enclose an area
     subtype:  backstop  a fence or screen (as behind home plate in baseball)
     subtype:  chainlink_fence__chainlinkfence  a fence of steel wires woven into a diamond pattern
     subtype:  hedgerow__hedge  a fence formed by a row of closely planted shrubs or bushes
        subtype:  privet_hedge  hedge of privet plants
        subtype:  windbreak  hedge or fence of trees designed to lessen the force of the wind and reduce erosion
     subtype:  picket_fence__paling  a fence made of upright pickets
     subtype:  rail_fence  a fence (usually made of split logs laid across each other at an angle)
        subtype:  worm_fence__snake_fence__snake-rail_fence__Virginia_fence  rail fence consisting of a zigzag of interlocking rails
     subtype:  stone_wall__stonewall  a fence built of rough stones; used to separate fields
        subtype:  dry_wall__drywall__dry-stone_wall__drystonewall  a stone wall made with stones fitted together without mortar
     subtype:  wall.fencing  a masonry fence (as around an estate or garden); "the wall followed the road"; "he ducked behind the garden wall and waited"
        subtype:  party_wall__partywall  a wall erected on the line between two properties and shared by both owners
        subtype:  retaining_wall__retainingwall  a wall that is built to resist lateral pressure (especially a wall built to prevent the advance of a mass of earth)
     subtype:  weir.fencing  a fence or wattle built across a stream to catch or retain fish
  subtype:  fender.barrier__wing  a barrier that surrounds the wheels of a vehicle to block splashing water or mud; "in England they call a fender a wing"
     subtype:  mudguard__splashguard  a curved piece above the wheel of a bicycle or motorcycle to protect the rider from water or mud thrown up by the wheels
  subtype:  grating  a barrier that has parallel or crossed bars blocking a passage but admitting air
     subtype:  radiator_grille__grille  grating that admits cooling air to car's radiator
  subtype:  hurdle  a light movable barrier that competitors must leap over in certain races
  subtype:  movable_barrier__movablebarrier  a barrier that can be moved to allow passage
     subtype:  chicane  a movable barrier used in motor racing; sometimes place before a dangerous corner to reduce speed as cars pass in single file
     subtype:  door  a swinging or sliding barrier that will close the entrance to a room or building; "he knocked on the door"; "he slammed the door as he left"
        subtype:  car_door__cardoor  the door of a car
           subtype:  hatchback  a sloping rear car door that is lifted to open
        subtype:  cargo_door__cargodoor  door used to load or unload cargo
        subtype:  double_door  two vertical doors that meet in the middle of the door frame when closed
        subtype:  fire_door  a fire-resistant door that can be closed to stop the spread of a fire
        subtype:  French_door  a light door with transparent or glazed panels extending the full length
           subtype:  French_window  a French door situated in an exterior wall of a building
        subtype:  interior_door  a door that closes off rooms within a building
           subtype:  bi-fold_door  an interior door
           subtype:  folding_door__foldingdoor__accordion_door__accordiondoor  an interior door that opens by folding back in sections (rather than by swinging on hinges)
        subtype:  screen_door__screen  a door that is a screen to keep insects from entering a building through the open door; "he heard the screen slam as she left"
        subtype:  sliding_door__slidingdoor  a door that opens by sliding instead of swinging
           subtype:  barn_door  the large sliding door of a barn
        subtype:  swing_door__swingdoor__swinging_door  a door that swings on a double hinge; opens in either direction
           subtype:  batwing  one of a pair of swinging doors (as at the entrance to a western saloon)
        subtype:  trap_door  a hinged or sliding door in a floor or ceiling
     subtype:  door.movable_barrier  a swinging or sliding barrier that will close off access into a car; "she forgot to lock the doors of her car"
     subtype:  gate  a door-like movable barrier in a fence or wall
        subtype:  head_gate  a gate upstream from a lock or canal that is used to control the flow of water at the upper end
        subtype:  lock-gate  a gate that can be locked
        subtype:  lychgate__lichgate  a roofed gate to a churchyard, formerly used as a temporary shelter for the bier during funerals
        subtype:  portcullis  gate consisting of an iron or wooden grating that hangs in the entry to a castle or fortified town; can be lowered to prevent passage
        subtype:  postern  a small gate in the rear of a fort or castle
        subtype:  tailgate__tailboard  a gate at the rear of a vehicle; can be lowered for loading
        subtype:  tail_gate  a gate downstream from a lock or canal that is used to control the flow of water at the lower end
        subtype:  tollgate__tollbar  a gate or bar across a toll bridge or toll road which is lifted when the toll is paid
        subtype:  turnpike  (from 16th to 19th centuries) gates set across a road to prevent passage until a toll had been paid
        subtype:  turnstile  a gate consisting of a post that acts as a pivot for rotating arms; set in a passageway for controlling the persons entering
        subtype:  wicket_door__wicket__wicket_gate  small gate or door (especially one that is part of a larger door)
        instance:  Dipylon_gate__Dipylon
     subtype:  hatch  a movable barrier covering a hatchway
        subtype:  cargo_hatch__cargohatch  hatch opening into the cargo compartment
  subtype:  railing.barrier__rail  a barrier consisting of a horizontal bar and supports
     subtype:  bar.railing  (law) a railing that encloses the part of the courtroom where the the judges and lawyers sit and the case is tried
     subtype:  fife_rail  the railing surrounding the mast of a sailing vessel
     subtype:  safety_rail__guardrail  a railing placed alongside a stairway or road for safety
     subtype:  taffrail  the railing around the stern of a ship
  subtype:  revetment  a barrier against explosives
  subtype:  roadblock__barricade  a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.
  subtype:  starting_gate__starting_stalls  a movable barrier on the starting line of a race course

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