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A circumscribed stable malformation of the skin and occasionally of the oral mucosa, which is not due to external causes and therefore presumed to be of hereditary origin. The excess (or deficiency) of tissue may involve epidermal, connective tissue, adnexal, nervous, or vascular elements. (Dorland, 27th ed)
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Word of the day
Snake's-head
- Guinea-hen flower; -- so called in England because its spotted petals resemble the scales of a snake's head.