- 3 Geology an intrusion of igneous rock cutting across existing strata. Compare with sill.
verb[with object] (often as adjective dyked)
Middle English (denoting a trench or ditch): from Old Norse dík, related to ditch. 2sense 1 of the noun) in Oxford Dictionaries (British & World English)">2sense 1 of the noun has been influenced by Middle Low German dīk 'dam' and Middle Dutch dijc 'ditch, dam'
Dyke can also be spelled dike: both are correct.