asthenosphere

 : 
Noun
 : 
as=then=o=sphere

WORDNET DICTIONARY

Noun asthenosphere has 1 sense

CIDE DICTIONARY

asthenospheren. 
     the lower layer of the earth's crust, below the lithosphere. It is estimated as from fifty to several hundred miles thick. It is less rigid than the lithosphere, but still rigid enough to transmit some transverse seismic waves.  [WordNet 1.5]

For further exploring for "asthenosphere" in Webster Dictionary Online


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