Having the nature or characteristics of the epidermis; relating to or composed of epidermis.
From epiderm- plus the adjective suffix '-atous' (or '-ous'), another technical way to form adjectives in medical and scientific terminology meaning 'having the quality of' or 'characterized by.'
The suffixes '-oid', '-atic', '-atous', and '-al' all create adjectives from 'epiderm,' but scientists and doctors have gradually standardized on '-al' in modern usage—the others show up in older texts like linguistic fossils!
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