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A dike is a sheet-shaped igneous intrusion. Cuts across existing rock structures.[1]

A dike (also spelled dyke[2]) is also an elongated raised earthen mound used as a flood defence or to protect reclaimed land (see Polder).


  1. Pellant, Chris. The Complete Book of Rocks and Minerals, Dorling Kindersley Inc.: New York (1995). 250.
  2. The Free Dictionary - definition of dike