caliche

About 0.09 uses per million words.

Meaning

1. noun A crude form of sodium nitrate from South America; used as a fertilizer.
2. noun A layer of hard clay subsoil or sedimentary rock; hardpan.

Similar words

hardpan chile saltpetre calcium nitrate nitrocalcite nitrochalk nitratine calcarinite calcia chalcanthite calcarenite

Often followed by

is and in layer or deposits road nodules soil

Word family

caliches