1. Resembling epidermis. 2. A cholesteatoma or other cystic tumor arising from aberrant epidermal cells. [epidermis + G. eidos, appearance]
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epi·der·moid -'dər-.mȯid adj resembling epidermis or epidermal cells: made up of elements like those of epidermis <\epidermoid cancer of the lung>
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adj.
having the appearance of epidermis (the outer layer of the skin): used to describe certain tumours of tissues other than the skin.
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epi·der·moid (ep″ĭ-durґmoid) 1. resembling epidermis. Called also 2. epidermal. epidermal (def. 1). 3. epidermoid cyst (def. 2).Medical dictionary. 2011.