(1) An underwater or intertidal area in which a particular organism is established in large numbers. (2) The bottom of a body of water, such as a stream. (Geology) A rock mass of large horizontal extent bounded, especially above, by physically different material (as in Bedrock).
BED
Meaning of BED in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012