The Collaborative International Dictionary of English v.0.48:

Mudar \Mu"dar\, n. [Hind. mad[=a]r.] (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]