WordReference Random House Unabridged Dictionary of American English © 2025
ar•gil•lite
(är′jə līt′),USA pronunciation n.
ar•gil•lit•ic
(är′jə lit′ik),USA pronunciation adj.
- Geology, Rocksany compact sedimentary rock composed mainly of clay materials; clay stone.
- Latin argill(a) argil + -ite1
- 1785–95
'argillite' also found in these entries (note: many are not synonyms or translations):