One of the mysteries of the English language finally explained.
1Anatomy. A mucosal layer, a mucous membrane. Now rare.
2Histology. The deep layer of a stratified squamous epithelium, comprised of living cells. Compare "Malpighian layer", rete mucosum. Now historical.
3Biology. A layer of mucus, especially that overlying a mucous membrane.
Mid 19th century (in an earlier sense). From mucous + layer.
mucous layer/ˌmjuːkəs ˈleɪə/
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