the outer boundary of an artifact or a material layer constituting or resembling such a boundary | any broad thin and limber covering attached at one edge; hangs loose or projects freely |
a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | a movable airfoil that is part of an aircraft wing; used to increase lift or drag |
a superficial aspect as opposed to the real nature of something | a movable piece of tissue partly connected to the body |
information that has become public | the motion made by flapping up and down |
the extended two-dimensional outer boundary of a three-dimensional object | an excited state of agitation |
the outermost level of the land or sea | |