The following origin of concrete is given in the dictionary.com (http://dictionary.reference.com/browse/concrete):
Concrete, an artificial, stonelike material used for various structural purposes,made by mixing cement and various aggregates, as sand, pebbles,gravel, or shale, with water and allowing the mixture to harden.
Origin: 1375-1425; late Middle English concret < Latin concrētus (past participleof concrēscere to grow together), equivalent to con- con- + crē- (stem of crēscere to grow, increase; see -esce ) + -tus past participle ending
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