IPA: /ˌɛpɪˈdɜːrməl/
KK: /ˌɛpɪˈdɜrməl/
Relating to the outer layer of skin.
The doctor explained that the epidermal layer protects the body from external harm.
Epidermal → It is formed from "epi-" (meaning upon or over) and "derma" (from Greek, meaning skin). The word "epidermal" refers to something that is related to or situated upon the outer layer of the skin.
Think of something that is 'upon' ('epi-') the 'skin' ('derma') — that's why epidermal relates to the outer layer of the skin.