#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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