argillaceous

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Related to argillaceously: Argillaceous sandstone, argillaceous rock

ar·gil·la·ceous

 (är′jə-lā′shəs) or ar·gil·lic (är-jĭl′ĭk)
adj.
Containing, made of, or resembling clay; clayey.

[From Latin argillāceus, from argilla, argil; see argil.]

argillaceous

(ˌɑːdʒɪˈleɪʃəs)
adj
(Geological Science) (of sedimentary rocks and deposits) composed of very fine-grained material, such as clay, shale, etc. Compare arenaceous1, rudaceous

ar•gil•la•ceous

(ˌɑr dʒəˈleɪ ʃəs)

adj.
of the nature of or resembling clay; clayey.
[1725–35; < Latin argillāceus <argilla clay]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.argillaceous - resembling or containing clayargillaceous - resembling or containing clay; "argillaceous rocks"
arenaceous, sandlike, sandy - resembling or containing or abounding in sand; or growing in sandy areas; "arenaceous limestone"; "arenaceous grasses"