the outer boundary of an artifact or a material layer constituting or resembling such a boundary | a device for making something stable |
a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | airfoil consisting of a device for stabilizing an aircraft |
a superficial aspect as opposed to the real nature of something | a chemical that is added to a solution or mixture or suspension to maintain it in a stable or unchanging state |
information that has become public | |
the extended two-dimensional outer boundary of a three-dimensional object | |
the outermost level of the land or sea | |