A material layer constituting such a boundary, A portion of space having length and breadth but no thickness, Outward or external appearance_ what appears on a slight view or without examination, intransitive verb_ To show up, as a person who was in hiding, To become known or public; -- said of information, To rise from the depths of a liquid to the surface, transitive verb_ To give a surface to; especially, to cause to have a smooth or plain surface; to make smooth or plain, To work over the surface or soil of, as ground, in hunting for gold, adjective_ Relating to or occurring on or near the surface of the earth, Apparent as opposed to real, Relating to, on, or at a surface, The two-dimensional locus of points located in three-dimensional space, A material layer constituting such a boundary, An elassoidal surface (which see, above)_ an ordinary use, but not quite accurate