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pian Definition
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pian
noun(pi-an)yaws
pian
noun plural but singular or plural in construction(pi-an)an infectious contagious tropical disease that is caused by a spirochete of the genus Treponema (T. pertenue) and that is characterized by a primary ulcerating lesion on the skin followed by a secondary stage in which ulcers develop all over the body and by a third stage in which the bones are involved —called also frambesia, pian