from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The outer part of the earth, consisting of the crust and upper mantle, approximately 100 km (62 mi.) thick.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The rigid, mechanically strong, outer layer of the Earth; divided into twelve major plates
from the GNU version of the Collaborative International Dictionary of English
- n. The solid earth as distinguished from its fluid envelopes, the hydrosphere and atmosphere.
- n. The outer part of the solid earth, the portion undergoing change through the gradual transfer of material by volcanic eruption, the circulation of underground water, and the process of erosion and deposition. It is, therefore, regarded as a third mobile envelope comparable with the hydrosphere and atmosphere.
from The Century Dictionary and Cyclopedia
- n. The crust of the earth: a designation corresponding with atmosphere and hydrosphere. [Little used.]
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the solid part of the earth consisting of the crust and outer mantle
From litho- + sphere (Wiktionary)