Relating to or resembling the epidermis; of or pertaining to the outer skin layer.
From epiderm plus the adjective-forming suffix '-atic,' an alternative way to form adjectives from noun stems, used in technical and scientific contexts alongside the more common '-al' suffix.
You might see 'epidermatic' in older medical texts or very technical papers, but modern doctors and scientists prefer 'epidermal'—this is a great example of how scientific language naturally selects certain word forms over others and drops the rest.
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