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Definition of Lignans
1. lignan [n] - See also: lignan
Medical Definition of Lignans
1. A class of dibenzylbutane derivatives which occurs in higher plants and in fluids (bile, serum, urine, etc.) in man and other animals. These compounds, which have a potential anti-cancer role, can be synthesised in vitro by human faecal flora. (12 Dec 1998)