Zoology. an underlayer of epithelial cells in arthropods and certain other invertebrates that secretes substances for the overlying cuticle or exoskeleton.
Botany. a tissue or layer of cells beneath the epidermis.
Also, hypoderm.

1865–70; hypo- + -dermis

hypodermal, adjective
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World English Dictionary
hypodermis or hypoderm (ˌhaɪpəˈdɜːmɪs)
1.  botany a layer of thick-walled supportive or water-storing cells beneath the epidermis in some plants
2.  zoology the epidermis of arthropods, annelids, etc, which secretes and is covered by a cuticle
[C19: from hypo- + epidermis]
hypoderm or hypoderm
[C19: from hypo- + epidermis]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hypodermis hy·po·der·mis (hī'pə-dûr'mĭs) or hy·po·derm (hī'pə-dûrm')

  1. An epidermal layer of cells that secretes an overlying chitinous cuticle, as in arthropods.

  2. See tela subcutanea.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for hypodermis
Sclerenchymatous cells mainly occur in hypodermis, pericycle, secondary xylem and phloem.
Hypodermis the hypodermis is not part of the skin, and lies below the dermis.
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