(physics) the curved upper surface of a nonturbulent liquid in a vertical tube | the outer boundary of an artifact or a material layer constituting or resembling such a boundary |
(optics) a lens that is concave on one side and convex on the other | a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight |
(anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint | a superficial aspect as opposed to the real nature of something |
| information that has become public |
| the extended two-dimensional outer boundary of a three-dimensional object |
| the outermost level of the land or sea |