ARGILLACEOUS

argillaceous|argillous. Argillaceous, or Argillous, a. clayish, consisting of clay

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Ar′gil‐la″ceous (�), a. [[L. argillaceus, fr. argilla.]] Of the nature of clay; consisting of, or containing, argil or clay; clayey. Argillaceous sandstone (Geol.), a sandstone containing much clay. — Argillaceous iron ore, the clay ironstone. — Argillaceous schist or state. See Argillite.