Entry 1 sense Webster, 1913 Epidermal /ĕpˌ-əd-ẽrm'-əl/ · Ep·i·der·mal · IPA /ˌɛpɪˈdɝməl/ 01 a. Of or pertaining to the epidermis; epidermic; cuticular. 1. Of or pertaining to the epidermis; epidermic; cuticular.