‖n. [ Hind. madār. ] (Bot.) Either one of two asclepiadaceous shrubs (Calotropis gigantea, and Calotropis procera), which furnish a strong and valuable fiber. The acrid milky juice is used medicinally. [ Also spelled madar and muddar. ] [ 1913 Webster ]

n. (Chem.) A brown, amorphous, bitter substance having a strong emetic action, extracted from the root of the mudar. [ 1913 Webster ]