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