Etymology
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asthenosphere (n.)

layer of the Earth's upper mantle, 1914, literally "sphere of weakness" (by comparison with the lithosphere), from Greek asthenes "weak" (see asthenia) + sphere.

updated on October 14, 2021

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Definitions of asthenosphere from WordNet

asthenosphere (n.)
the lower layer of the crust;
From wordnet.princeton.edu, not affiliated with etymonline.