#amorphous_shape__amorphousshape an ill-defined or arbitrary shape
supertype: #shape__form the spatial arrangement of something as distinct from its substance; "geometry is the mathematical science of shape"
subtype: #shapelessness.amorphous_shape__shapelessnes an amorphous or indefinite shape; "a shapeless mass"
subtype: #blob an indistinct shapeless form
subtype: #space.amorphous_shape an empty area (usually bounded in some way between things); "the architect left space in front of the building"; "they stopped at an open space in the jungle"; "the space between his teeth"
subtype: #pleural_space__pleuralspace the small potential space between the parietal and visceral layers of the pleura
subtype: #subarachnoid_space a space in the meninges beneath the arachnoid membrane and above the pia mater that contains the cerebrospinal fluid
subtype: #opening.space__gap an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall"
subtype: #Ranvier's_nodes__nodes_of_Ranvier small gaps in the myelin sheath of medullated axons
subtype: #foramen__hiatus a natural opening or perforation through a bone or a membranous structure
subtype: #interventricular_foramen__foramen_of_Monro__Monro's_foramen the small opening (on both the right and left sides) that connects the third ventricle in the diencephalon with the lateral ventricle in the cerebral hemisphere
subtype: #foramen_magnum__foramenmagnum the large opening at the base of the cranium through which the spinal cord passes
subtype: #breach.opening an opening (especially a gap in a dike or fortification)
subtype: #chasm a deep opening in the earth's surface
subtype: #abyss__abys a bottomless gulf or pit
subtype: #gulf.chasm a deep wide chasm
subtype: #scissure__crack__cleft__crevice__fissure a long narrow opening
subtype: #chap.scissure a crack in a lip caused usually by cold
subtype: #chink a narrow opening as e.g. between planks in a wall
subtype: #crevasse a deep fissure
subtype: #fatigue_crack__fatiguecrack a crack in metal resulting from metal fatigue
subtype: #geological_fault__fault__shift__fracture__break (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other; "they built it right over a geological fault"
subtype: #Denali_Fault a major open geological fault in Alaska
subtype: #inclined_fault a geological fault in which one side is above the other
subtype: #normal_fault__gravity_fault__common_fault an inclined fault in which the hanging wall appears to have slipped downward relative to the footwall
subtype: #thrust_fault__overthrust_fault__reverse_fault__reversefault a geological fault in which the upper side appears to have been pushed upward by compression
subtype: #strike-slip_fault a geological fault in which one of the adjacent surfaces appears to have moved horizontally
instance: #San_Andreas_Fault
subtype: #rift.scissure a narrow fissure in rock
subtype: #slit.scissure a narrow fissure
subtype: #split.scissure a lengthwise crack in wood; "he inserted the wedge into a split in the log"
subtype: #vent.scissure__volcano a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
subtype: #volcanic_crater__crater a bowl-shaped opening at the top of a volcano
subtype: #caldera a large crater caused by the violent explosion of a volcano that collapses into a depression
subtype: #maar a flat-bottomed volcanic crater that was formed by an explosion; often filled with water
subtype: #hole.opening an opening into or through something
subtype: #aperture.hole an opening in something
subtype: #pupil contractile aperture in the iris of the eye
subtype: #micropyle minute opening in the wall of an ovule through which the pollen tube enters
subtype: #stoma.aperture__pore a minute epidermal pore in a leaf or stem
subtype: #bolt-hole a hole through which an animal may bolt when pursued into its burrow or den
subtype: #bullet_hole a hole made by a bullet passing through it
subtype: #cranny a small opening or crevice (especially in a rock face or wall)
subtype: #leak.hole an accidental hole that allows something (fluid or light etc.) to enter or escape; "one of the tires developed a leak"
subtype: #ozone_hole__ozonehole an area of the ozone layer (near the poles) that is seasonally depleted of ozone
subtype: #perforation.hole a hole made in something; "a perforation of the eardrum"
subtype: #rathole a hole (as in the wall of a building) made by rats
subtype: #knothole a hole in a board where a knot came out
subtype: #mouth-like_space_opening__mouth an opening that resembles a mouth (as of a cave or a gorge); "he rode into the mouth of the canyon"; "they built a fire at the mouth of the cave"
subtype: #rift a gap between cloud masses; "the sun shone through a rift in the clouds"
subtype: #rip__rent__split__tear an opening made forcibly as by pulling apart; "there was a rip in his pants"
subtype: #window.opening an opening that resembles a window in appearance or function; "he could see them through a window in the trees"
subtype: #swath the space created by the swing of a scythe or the cut of a mowing machine
subtype: #void__vacancy__emptines an empty area or space; "the huge desert voids"; "the emptiness of outer space"
subtype: #hole.space an unoccupied space
subtype: #pore any tiny hole admitting passage of a liquid (fluid or gas)
subtype: #enclosed_space__cavity space that is surrounded by something
subtype: #hollow a cavity or space in something; "hunger had caused the hollows in their cheeks"
subtype: #pouch.enclosed_space__sac__sack__pocket an enclosed space
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