hypodermis
noun
hy·po·der·mis
ˌhī-pə-ˈdər-məs
1
: the tissue immediately beneath the epidermis of a plant especially when modified to serve as a supporting and protecting layer
2
: the cellular layer that underlies and secretes the chitinous cuticle (as of an arthropod)
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Merriam-Webster unabridged
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