1. an embankment for controlling or holding back the waters of the sea or a river: They built a temporary dike of sandbags to keep the river from flooding the town.
  2. a ditch.
  3. a bank of earth formed of material being excavated.
  4. a causeway.
  5. British Dialect. a low wall or fence, especially of earth or stone, for dividing or enclosing land.
  6. an obstacle; barrier.
  7. Geology.
    1. a long, narrow, cross-cutting mass of igneous rock intruded into a fissure in older rock.
    2. a similar mass of rock composed of other kinds of material, as sandstone.
  8. Australian Slang. a urinal.

verb (used with object), diked, dik·ing.

  1. to furnish or drain with a dike.
  2. to enclose, restrain, or protect by a dike: to dike a tract of land.

noun Slang: Disparaging and Offensive.

  1. dyke2.

noun Slang: Disparaging and Offensive.

  1. a contemptuous term used to refer to a lesbian.

noun, verb

  1. a variant spelling of dyke 1


  1. Greg (ory). born 1947, British television executive; director-general of the BBC (2000–04)


  1. an embankment constructed to prevent flooding, keep out the sea, etc
  2. a ditch or watercourse
  3. a bank made of earth excavated for and placed alongside a ditch
  4. Scot a wall, esp a dry-stone wall
  5. a barrier or obstruction
  6. a vertical or near-vertical wall-like body of igneous rock intruded into cracks in older rock
  7. Australian and NZ informal
    1. a lavatory
    2. (as modifier)a dyke roll


  1. civil engineering an embankment or wall built to confine a river to a particular course
  2. (tr) to protect, enclose, or drain (land) with a dyke


  1. slang a lesbian

1931, American English, perhaps a shortening of morphadike, dialectal garbling of hermaphrodite; but bulldyker “engage in lesbian activities” is attested from 1921, and a source from 1896 lists dyke as slang for “the vulva.”

[T]he word appears first in the long forms, bulldiker and bulldyking, both used in the 1920s by American blacks. No African antecedents have been found for the term, however, which leads to the possibility that this is basically just another backcountry, barnyard word, perhaps a combination of BULL and DICK. [Rawson]


Old English dic “trench, ditch; an earthwork with a trench; moat,” from Proto-Germanic *dik- (cf. Old Norse diki “ditch, fishpond,” Old Frisian dik “mound, dam,” Middle Dutch dijc “mound, dam, pool,” Dutch dijk “dam,” German Deich “embankment”), from PIE root *dheigw- “to pierce, fasten” (cf. Sanskrit dehi- “wall,” Old Persian dida “wall, stronghold, fortress,” Persian diz).

At first “an excavation,” later (late 15c.) applied to the resulting earth mound; a sense development paralleled by cognate forms in many other languages. This is the northern variant of the word that in the south of England yielded ditch (n.).

  1. 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.
  2. An embankment of earth and rock built to prevent floods or to hold irrigation water in for agricultural purposes.

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