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asthenosphere

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noun as·theno·sphere \as-ˈthe-nə-ˌsfir\

Definition of asthenosphere

  1. :  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 of asthenosphere

Greek asthenēs weak + English -o- + sphere


First Known Use: 1914



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