Any of several evergreen trees of the genus Citrus, family Rutaceae, which bear blossom and fruit at the same time. Thought to have originated in se Asia, orange trees are commercially cultivated in Spain, Israel, the us, Brazil, South Africa, and elsewhere. The sweet orange c. sinensis is the one commonly eaten fresh; the Jaffa, blood, and navel orange are varieties of this species.
Tangerines and mandarins belong to a related species c. reticulata. The sour orange or Seville c. aurantium is the bitter orange used in making marmalade. Oranges yield several essential oils.
1. Any citrus tree bearing oranges; SYN. orange tree.
2. Round yellow to orange fruit of any of several citrus trees.
3. Any pigment producing the orange color.
4. Any of a range of colors between red and yellow; SYN. orangeness.