Asthenosphere
//asˈθɛnə(ʊ)sfɪə//
"Asthenosphere" in a Sentence (3 examples)
Holonyms: upper mantle, outer mantle < mantle < Earth
To say that the lithosphere floats on top of the asthenosphere suggests a degree of easy buoyancy that isn't quite right.
The asthenosphere that underlies the surface plates is not liquid in any vernacular sense, although it is relatively plastic.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.