a facility that provides a source of water | the outer boundary of an artifact or a material layer constituting or resembling such a boundary |
a liquid necessary for the life of most animals and plants | a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight |
the part of the earth's surface covered with water (such as a river or lake or ocean) | a superficial aspect as opposed to the real nature of something |
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 | information that has become public |
liquid excretory product | the extended two-dimensional outer boundary of a three-dimensional object |
once thought to be one of four elements composing the universe (Empedocles), associated with the humour phlegm | the outermost level of the land or sea |