From WordNet (r) 3.0 (2006): hardpan n 1: crust or layer of hard subsoil encrusted with calcium- carbonate occurring in arid or semiarid regions [syn: caliche, hardpan]
hardpan n 1: crust or layer of hard subsoil encrusted with calcium- carbonate occurring in arid or semiarid regions [syn: caliche, hardpan]
