peri·derm 'per-ə-.dərm n the outer layer of the epidermis of the skin esp. of the embryo
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n.
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peri·derm (perґĭ-durm″) [peri- + -derm] 1. the large-celled outer layer of the two-layered fetal epidermis, which is loosened by hair that grows beneath it and generally disappears before birth. Called also epitrichium. the 2. cuticle (eponychium) and hyponychium considered together.Medical dictionary. 2011.