(n)surfacethe outer boundary of an artifact or a material layer constituting or resembling such a boundary“there is a special cleaner for these surfaces”, “the cloth had a pattern of red dots on a white surface”
(n)surfacethe 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”
(n)surface, Earth's surfacethe outermost level of the land or sea“earthquakes originate far below the surface”, “three quarters of the Earth's surface is covered by water”
(n)airfoil, aerofoil, control surface, surfacea device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight
(v)come on, come out, turn up, surface, show upappear or become visible; make a showing“She turned up at the funeral”, “I hope the list key is going to surface again”