What does argilliferous mean?
'Argilliferous' is a technical adjective meaning containing or producing clay. It derives from Latin 'argilla', the term for potters' clay, combined with the suffix '-ferous' ('bearing' or 'yielding'), so the word literally describes something that carries clay. In practice it appears almost exclusively in geology, mining, and soil science, where it labels strata, rocks, or sediments with a significant clay component — one might speak of 'argilliferous strata' in a borehole log or an 'argilliferous horizon' in a sedimentary sequence. It functions as a close synonym of the much more common 'argillaceous', which has largely displaced it in modern usage, so encountering 'argilliferous' today often signals an older text or a deliberately formal register. For readers outside the earth sciences it is chiefly of interest as an example of how Latin roots persist in scientific vocabulary.
adjectiveContaining or producing clay; especially of geological strata, rocks, or soils that have a significant clay component.
- (Of rock, strata, or soil) containing or yielding a notable proportion of clay.
"The argilliferous beds in the quarry yielded a fine grey clay used by the local brickworks."
"The survey identified several argilliferous horizons within the otherwise sandy formation."
"Farmers prized the valley's argilliferous soil for its ability to hold moisture through dry summers."
Built from the Latin word for potters' clay, 'argilliferous' literally means 'clay-carrying' — the same root that gives us 'argillaceous' and even the mineral name 'argillite'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of argilliferous
The word comes from Latin 'argilla', meaning potters' clay or white earth, joined to the suffix '-ferous', from Latin 'ferre' ('to bear'), giving the sense 'clay-bearing'. English adopted it alongside its sibling 'argillaceous' (from the same Latin root via the adjective 'argillaceus'), both entering scientific usage around the late eighteenth and early nineteenth centuries as geology developed its descriptive terminology. Related descendants of 'argilla' include 'argil' (a clay or potter's earth) and 'argillite' (a claystone rock).
How argilliferous is actually used
A technical term used chiefly in geology, mining, and soil science; rare in everyday language and largely superseded by the more common synonym 'argillaceous'.
Easily confused with argilliferous
Both mean clay-containing and are near-synonyms, but 'argillaceous' is the far more common term for clay-rich rocks, while 'argilliferous' emphasizes bearing or yielding clay.