a. rare. [a. OF. argillus, -os, -ous (mod. argileux):L. argillōsum: see prec. and -OUS.] Clayey, argillaceous.
c. 1420. Pallad. on Husb., IV. 496. With stones myxt it stont in argillous Lande.
1646. Sir T. Browne, Pseud. Epid., 321. The sand and argillous earth at the bottome.
1882. Elwes, trans. Capello & Ivens Benguella to Yacca, I. iv. 104. The productive strength of this argillous silicious soil.