#bounds__boundary the line or plane indicating the limit or extent of something
supertype: #extremity.region the outermost or farthest region or point
instance: #Rubicon
subtype: #hairline the natural margin formed by hair on the head
subtype: #frontier.bounds an international boundary or the area (often fortified) immediately inside the boundary
subtype: #heliopause the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind and the wind from other stars meet
subtype: #boundary_line__border__borderline__delimitation a line that indicates a boundary
subtype: #fence_line__fenceline a boundary line created by a fence
subtype: #property_line the boundary line between two pieces of property
subtype: #state_line__stateline__stateboundary the boundary between two states
instance: #Mason-Dixon_Line__Mason_and_Dixon_Line__Mason_and_Dixon's_Line
subtype: #bourne__bourn an archaic term for a boundary
subtype: #district_line the boundary between two districts
subtype: #county_line the boundary between two counties
subtype: #city_line the boundary of a city
subtype: #edge.bounds__border the boundary of a surface
subtype: #brink the edge of a steep place
subtype: #end.bounds a boundary marking the extremities of something: "the end of town"
subtype: #demarcation__demarcation_line__demarcationline the boundary of a specific area
subtype: #city_limit__city_limits the limits of the area occupied by a city or town
subtype: #upper_limit the limit on the upper (or northernmost) side of something
subtype: #lower_limit__lowerlimit the limit on the lower (or southernmost) side of something
subtype: #three-mile_limit the limit of a nation's territorial waters
subtype: #outline the line that appears to bound an object
subtype: #coastline the outline of a coast
subtype: #silhouette an outline of a solid object (as cast by its shadow)
subtype: #skyline the outline of objects seen against the sky
subtype: #surface.bounds the extended two-dimensional outer boundary of a three-dimensional object; "they skimmed over the surface of the water"; "a brush small enough to clean every dental surface"; "the sun has no distinct surface"
subtype: #interface (physical chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases)
subtype: #oil-water_interface__oilwaterinterface an interface forming the boundary between the non-miscible liquids oil and water
subtype: #hard_palate the bony part of the roof of the mouth
subtype: #palate__roof_of_the_mouth the upper surface of the mouth that separates the oral and nasal cavities
subtype: #side.surface__face a surface forming part of the outside of an object; "he examined all sides of the crystal"; "dew dripped from the face of the leaf"
subtype: #beam-ends (nautical) at the ends of the transverse deck beams of a vessel; "on her beam-ends" means heeled over on the side so that the deck is almost vertical
subtype: #underside__bottom__undersurface the lower side of anything
subtype: #base.underside a flat bottom on which something is intended to sit; "a tub should sit on its own base"
subtype: #bilge where the sides of the vessel curve in to form the bottom
subtype: #bilges in a vessel with two hulls, an enclosed area between the frames at each side
subtype: #heel the bottom of a shoe or boot; the back part of a shoe or boot that touches the ground
subtype: #Cuban_heel a broad heel of medium height on women's shoes
subtype: #French_heel a fairly high narrow heel on women's shoes
subtype: #spike_heel__spikeheel__stiletto_heel a very high narrow heel on women's shoes
subtype: #stacked_heel__stackedheel a heel made of many layers of leather
subtype: #wedge_heel__wedgeheel__wedge a heel that is an extension of the sole of the shoe
subtype: #wineglass_heel__wineglassheel a heel on a woman's shoe in the shape of a wineglass
subtype: #sole the underside of footwear or a golfclub
subtype: #half_sole shoe sole extending from the shank to the toe
subtype: #insole__innersole the inner sole of a shoe or boot
subtype: #outsole the outer sole of a shoe or boot
subtype: #underbelly.underside lower side: "the underbellies of clouds"
subtype: #front_end__frontend__front__forepart the side that is forward or prominent
subtype: #forefront__head the part in the front or nearest the viewer; "he was in the forefront"; "he was at the head of the column"
subtype: #lee_side__leeside__lee the side of something that is sheltered from the wind
subtype: #backside__rear__back_end the side of an object that is opposite its front; "his room was toward the rear of the hotel"
subtype: #nape__scruff__nucha the back side of the neck
subtype: #rearward direction toward the rear; "his outfit marched to the rearward of the tank divisions"
subtype: #top_side__topside__upper_side__upperside__upside the highest or uppermost side of anything; "put your books on top of the desk"; "only the top side of the box was painted"
subtype: #crown.top_side__crest the center of a cambered road
subtype: #poll.top_side the part of the head between the ears
subtype: #pate.top_side__poll__crown the top of the head
subtype: #tonsure.pate the shaved crown of a monk's or priest's head
subtype: #desktop the top of a desk
subtype: #rooftop the top of a (usually flat) roof
subtype: #celestial_sphere__celestialsphere__sphere__empyrean__firmament__heaven__vault_of_heaven__welkin the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
subtype: #end.surface the surface at either extremity of a three-dimensional object: "one end of the box was marked `This side up'"
subtype: #interior__inside the inner or enclosed surface of something
subtype: #exterior__outside the outer side or surface of something
subtype: #wavefront__wave_front (physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium
subtype: #photosphere the intensely luminous surface of the sun
subtype: #shoreline a boundary line between land and water
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