Search Result for "hardpan": 
Wordnet 3.0

NOUN (1)

1. crust or layer of hard subsoil encrusted with calcium-carbonate occurring in arid or semiarid regions;
[syn: caliche, hardpan]



The Collaborative International Dictionary of English v.0.48:

Hardpan \Hard"pan`\ (h[aum]rd"p[a^]n), n.
   The hard substratum. Same as Hard pan, under Hard, a.
   [1913 Webster]


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]