Asthenosphere

//asˈθɛnə(ʊ)sfɪə// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A portion of the Earth's upper mantle, below the lithosphere.

    "Holonyms: upper mantle, outer mantle < mantle < Earth"

  2. 2
    the lower layer of the crust wordnet

Example

More examples

"Holonyms: upper mantle, outer mantle < mantle < Earth"

Etymology

From astheno- + -sphere.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.