Definition of asthenosphere
: a zone of a celestial body (as the earth) which lies beneath the lithosphere and within which the material is believed to yield readily to persistent stresses
asthenosphericplay \-ˌthe-nə-ˈsfir-ik, -ˈsfer-\ adjective
Origin and Etymology of asthenosphere
Greek asthenēs weak + English -o- + sphere
First Known Use: 1914
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