#opening.artifact  a vacant or unobstructed space; "they left a small opening for the cat at the bottom of the door"
  supertype:  #artifact__artefact  a man-made object taken as a whole
  subtype:  #aperture.opening  an opening; usually small
     subtype:  #embouchure__mouthpiece  the aperture of a wind instrument into which the player blows directly
     subtype:  #mouthpiece.aperture  a part that goes over or into the mouth of a person; "the mouthpiece of a respirator"
  subtype:  #bell.opening  the flared opening of a tubular device
  subtype:  #breech__rear_of_barrel__rear_of_tube  opening in the rear of the barrel of a gun where bullets can be loaded
  subtype:  #way_out__wayout__exit__issue__outlet  an opening that permits escape or release; "he blocked the way out"; "the canyon had only one issue"
     subtype:  #outfall  the outlet of a river or drain or other source of water
  subtype:  #fly_front__flyfront__fly  an opening in a garment that is closed by a zipper or buttons concealed by a fold of cloth
  subtype:  #gap.opening__crack  a narrow opening; "he opened the window a crack"
     subtype:  #lacuna__blank  a blank gap or missing part
     subtype:  #spark_gap__sparkgap  the gap between two high-potential terminals
  subtype:  #gun_muzzle__gunmuzzle__muzzle__gunpoint  the open discharging end of a gun
     subtype:  #gunpoint__point  the gun muzzle's direction; "he held me up at the point of a gun"
  subtype:  #hole  an opening deliberately made in or through something
     subtype:  #air_hole__airhole  a hole that allows the passage of air
     subtype:  #armhole  a hole through which you put your arm and where a sleeve can be attached
     subtype:  #bunghole  a hole in a barrel or cask; used to fill or empty it
     subtype:  #buttonhole__button_hole  a hole through which buttons are pushed
     subtype:  #countersink  a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface
     subtype:  #cup.hole  the hole (or metal container in the hole) on a golf green; "he swore as the ball rimmed the cup and rolled away"; "put the flag back in the cup"
     subtype:  #ear_hole__earhole  a hole (as in a helmet) for sound to reach the ears
     subtype:  #eye.hole  a small hole or loop (as in a needle); "the thread wouldn't go through the eye"
     subtype:  #eyelet  a small hole (usually round and finished around the edges) in cloth or leather for the passage of a cord
     subtype:  #finger_hole  a hole for inserting a finger
        subtype:  #thumbhole  a finger hole made to fit the thumb (as in a bowling ball)
     subtype:  #finger_hole.hole__fingerhole  one of a series of holes in a woodwind instrument; pitch changes when a finger covers it
     subtype:  #hawse__hawsehole__hawsepipe  the hole that an anchor rope passes through
     subtype:  #keyhole  the hole where a key is inserted
     subtype:  #loophole.hole  a small hole in a fortified wall; for observation or discharging weapons
     subtype:  #lubber's_hole  hole in a platform on a mast through which a sailor can climb without going out on the shrouds
     subtype:  #manhole  a hole (usually with a flush cover) through which a person can gain access to an underground structure
     subtype:  #mortise__mortice  a square hole made to receive a tenon and so to form a joint
     subtype:  #mouth_hole__mouthhole  a hole (as in a ski mask) for the mouth
     subtype:  #nail_hole  a hole left after a nail is removed
     subtype:  #peephole__spyhole  a hole (in a door or an oven etc) through which you can peep
        subtype:  #judas__juda  a one-way peephole in a door
     subtype:  #perforation_line__perforationline__perforation  a line of small holes for tearing at a particular place
     subtype:  #plughole  (British) a hole into which a plug fits (especially a hole where water drains away)
     subtype:  #posthole__post_hole  a hole dug in the ground to hold a fence post
     subtype:  #puncture.hole  a small hole made by a sharp object
        subtype:  #pinhole  a small puncture that might have been made by a pin
        subtype:  #pinprick  small puncture (as if made by a pin)
     subtype:  #sound_hole__soundhole  a hole in a soundboard (as of a violin) designed to resonate with the tones
     subtype:  #thumbhole.hole  the hole in a woodwind that is closed and opened with the thumb
     subtype:  #venthole__vent__blowhole  a hole for the escape of gas or air
        subtype:  #smoke_hole__smokehole  a vent (as in a roof) for smoke to escape
  subtype:  #intake  an opening through which fluid is admitted to a tube or container
     subtype:  #air_horn__airhorn  air intake of a carburetor
  subtype:  #interstice  small opening between things
  subtype:  #fenestella__lunette  oval or circular opening; to allow light into a dome or vault
  subtype:  #opening_of_jar_or_bottle__mouth  the opening of a jar or bottle; "the jar had a wide mouth"
  subtype:  #neck  opening for the neck; the part of a garment near the neck opening
     subtype:  #neckline  the line formed by the edge of a garment around the neck
        subtype:  #crew_neck__crew_neckline  a plain straight neckline opening from shoulder to shoulder of sweaters
        subtype:  #decolletage  a low-cut neckline on a woman's dress
     subtype:  #V_neck  the neck of a garment has the shape in front of the letter V
  subtype:  #embrasure__port__porthole  an opening (in a wall or ship or armored vehicle) for firing through
  subtype:  #slit  a long narrow opening
     subtype:  #jag.slit  a slit in a garment that exposes material of a different color underneath; used in Renaissance clothing
     subtype:  #slot.slit  a small slit (as for inserting a coin or depositing mail)
        subtype:  #coin_slot  a slot through which coins can be inserted into a slot machine
        subtype:  #mail_slot  a slot (usually in a door) through which mail can be delivered
  subtype:  #spout  an opening that allows the passage of liquids or grain
     subtype:  #gargoyle.spout  a spout that terminates in a grotesquely carved figure of a person or animal
     subtype:  #nozzle__nose  a projecting spout from which a fluid is discharged
        subtype:  #showerhead  a perforated nozzle that showers water on a bather
  subtype:  #throat.opening  an opening in the vamp of a shoe at the instep
  subtype:  #grille__wicket__lattice  small opening (like a window in a door) through which business can be transacted
  subtype:  #vehicle_window__vehiclewindow__window  a transparent opening in a vehicle that allow vision out of the sides or back; usually is capable of being opened
     subtype:  #car_window__carwindow  a window in a car
        subtype:  #quarterlight  (British) car window consisting of a small pivoted glass vent in the door of a car
        subtype:  #rear_window  car window that allows vision out of the back of the car
  subtype:  #building_window__window  an opening in the wall of a building (usually to admit light and air); "he stuck his head in the window"
     subtype:  #ticket_window  a window through which tickets are sold (as from a ticket booth)

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