D defs.my
Entry 1 sense Webster, 1913

Argillaceous

· Ar·gil·la·ceous · IPA /ɑːd͡ʒɪlˈeɪʃəs/
01 a. Of the nature of clay; consisting of, or containing, argil or clay; clayey.
  1. 1.
    Of the nature of clay; consisting of, or containing, argil or clay; clayey.
Phrases & compounds
Argillaceous sandstone — a sandstone containing much clay.
Argillaceous iron ore — the clay ironstone.
Argillaceous schist [or] state — See Argillite.