Outer layer
Sheath and outer layer are semantically related. In some cases you can use "Sheath" instead a noun phrase "Outer layer".
Sheath
Sheath noun - Something that encloses another thing especially to protect it.
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Synonyms for Sheath
Outer layer and sheath are semantically related. Sometimes you can use "Outer layer" instead a noun "Sheath".
Mutual synonyms
Cite this Source
Sheath and Outer layer. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/outer_layer/sheath
Outer layer & Sheath. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/outer_layer/sheath>.
Sheath or Outer layer. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/outer_layer/sheath.
Google Ngram Viewer shows how "outer layer" and "sheath" have occurred on timeline