Argillaceous
Pronunciation : Ar`gil*la"ceous
Part of Speech : a.
Etymology : [L. argillaceus, fr. argilla.]
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913