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From The Collaborative International Dictionary of English v.0.48:
Hypoderma \Hyp`o*der"ma\, n. [NL. See Hypo, and derma.] 1. (Bot.) A layer of tissue beneath the epidermis in plants, and performing the physiological function of strengthening the epidermal tissue. In phanerogamous plants it is developed as collenchyma. [1913 Webster] 2. (Zool.) An inner cellular layer which lies beneath the chitinous cuticle of arthropods, annelids, and some other invertebrates. [1913 Webster]