A hardened conglomeration of gravel, rock, and soil that contains sodium nitrate, potassium nitrate, etc., found mainly in arid regions of Chile and Argentina.
A type of hardpan found in arid regions, as in the SW U.S., containing calcareous deposits, esp. of calcium carbonate.
Origin of caliche
American Spanish from Spanish pebble in a brick, flake of lime from cal lime from Latin calx calc- lime calx