Relating to, belonging to, or resembling the epidermis; affecting or concerning the outer layer of skin.
From epiderm plus the adjective suffix '-ic,' one of the most common ways to form adjectives in medical terminology, allowing flexibility in how doctors and scientists describe epidermal conditions and features.
Both 'epidermic' and 'epidermal' mean the same thing, but 'epidermal' is far more common in modern medicine—you'll see 'epidermic' mostly in older medical literature or in certain geographic regions like Britain where word preferences vary.
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