Composed of or containing clay or fine sediment; resembling clay in texture or composition.
From Latin 'argilla' (clay) plus '-aceous' (composed of). Used in geology and soil science since the 18th century to describe sedimentary materials.
This technical geological term sounds intimidating, but it just means 'clay-like'—geologists use fancy Latin-based words to precisely describe rock and soil types all over the world.
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