The spelling of the word "Epidermeous" can be explained using IPA phonetic transcription as /ˌɛpɪˈdɜːmiəs/. This word refers to something that pertains to the epidermis, which is the outermost layer of the skin. The first syllable, "epi," is pronounced as "eh-pee," and means "outer" or "upon." The second syllable, "derm," is pronounced as "dur-m," and means "skin." The final syllable, "-eous," is pronounced as "ee-uhs," and means "pertaining to or resembling." Together, the word "Epidermeous" describes something that pertains to the outer layer of the skin.
Epidermeous is not a recognized English word. However, if you meant to refer to epidermal, then the etymology of the word epidermal is as follows:
The word epidermal is derived from the Greek word epi- meaning on or upon and derma meaning skin. When combined, they form epidermis, which refers to the outermost layer of the skin. The suffix -al is added to epiderm- to form epidermal, meaning relating to the epidermis.