eponychium

noun
ep·​o·​nych·​i·​um | \ ˌep-ə-ˈnik-ē-əm How to pronounce eponychium (audio) \

Medical Definition of eponychium

1 : the thickened layer of epidermal tissue over the developing fetal fingernail or toenail that disappears before birth except over the base of the nail
2 : the distal margin of the superficial layer of a proximal nail fold that is a horny band of epidermis extending over the base of a nail : cuticle

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