Webster’s Revised Unabridged Dictionary · 1913 Argil Ar′gil (är′jĭl), n. [F. argile, L. argilla white clay, akin to Gr. ἄργιλλος or ἄργιλος or ἄργιλος argil, ἀργός white. See Argent.] (Min.) Clay, or potter's earth; sometimes pure clay, or alumina. See Clay. ‹ Argentry Argillaceous ›