A body of igneous rock that cuts across the structure of adjoining rock, usually as a result of the intrusion of magma. Dikes are often of a different composition from the rock they cut across. They are usually on the order of centimeters to meters across and up to tens of kilometers long. See illustration at batholith.
An embankment of earth and rock built to prevent floods or to hold irrigation water in for agricultural purposes.
[dahyk] 