the outer boundary of an artifact or a material layer constituting or resembling such a boundary | a facility that provides a source of water |
a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | a liquid necessary for the life of most animals and plants |
a superficial aspect as opposed to the real nature of something | the part of the earth's surface covered with water (such as a river or lake or ocean) |
information that has become public | binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent |
the extended two-dimensional outer boundary of a three-dimensional object | liquid excretory product |
the outermost level of the land or sea | once thought to be one of four elements composing the universe (Empedocles), associated with the humour phlegm |