Dictionary

asthenosphere

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

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
as·theno·spher·ic \-ˌthe-nə-ˈsfir-ik, -ˈsfer-\ adjective

Origin of ASTHENOSPHERE

Greek asthenēs weak + English -o- + sphere
First Known Use: 1914

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