| argillaceous | Of the nature of clay; consisting of, or containing, argil or clay; clayey. <geology> Argillaceous sandstone, a sandstone containing much clay. Argillaceous iron ore, the clay ironstone. Argillaceous schist or state. See Argillite. Origin: L. Argillaceus, fr. Argilla. Source: Websters Dictionary (01 Mar 1998) |
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