argillaceous

Meanings

1. 1
   adj

   made of, containing, or resembling clay

   The fossils were preserved in a thin layer of argillaceous limestone.

From Latin argillaceus, 'clayey,' from argilla, 'clay,' ultimately related to Greek argillos, 'white clay or potter's earth.' The deeper association is with Greek argos, 'white or shining,' referring to the pale color of some clays.

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