ETYM AS. bed, bedd; akin to OS. bed, Dutch bed, bedde, Icel. bedr, Dan. bed, Swed. bädd, Goth. badi, Old High Germ. betti, German bett, bette, bed, beet a plat of ground; all of uncertain origin.
In geology, a single sedimentary rock unit with a distinct set of physical characteristics or contained fossils, readily distinguishable from those of beds above and below. Well-defined partings called bedding planes separate successive beds or strata.
The depth of a bed can vary from a fraction of a centimeter to several meters or yards, and can extend over any area. The term is also used to indicate the floor beneath a body of water (lake bed) and a layer formed by a fall of particles (ash bed).
1. (Geology) A stratum of rock (especially sedimentary rock).
2. A depression forming the ground under a body of water; SYN. bottom.
3. A foundation of earth or rock supporting a road or railroad track.
4. A piece of furniture that provides a place to sleep.
5. A plot of ground in which plants are growing.