O·sage or·ange Bot. An ornamental tree of the genus Maclura (Maclura aurantiaca), closely allied to the mulberry (Morus); also, its fruit.  The tree was first found in the country of the Osage Indians, and bears a hard and inedible fruit of an orangelike appearance. See Bois d'arc.
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 osage orange
      n : small shrubby deciduous yellowwood tree of south central
          United States having spines, glossy dark green leaves and
          an inedible fruit that resembles an orange; its hard
          orange-colored wood used for bows by native Americans;
          frequently planted as boundary hedge [syn: bow wood, mock
          orange, Maclura pomifera]