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orange: orange: [14] The name of the orange originated in northern India, as Sanskrit nāranga. This passed westwards via Persian nārang and Arabic nāranj to Spain. The Spanish form naranj filtered up to France, and became altered (perhaps under the influence of Orange, the name of a town in southeastern France which used to be a centre of the orange trade) to orenge, later orange – whence the English word.
orang-utan: orang-utan: [17] Malay ōrang ūtan means literally ‘wild man’. It probably originated as a term used by those who lived in open, more densely populated areas for the ‘uncivilized’ tribes who lived in the forest, but was taken by early European travellers to refer to the large red-haired ape that inhabits the same forests. The word may well have reached English via Dutch.
Agent Orange (n.): powerful defoliant used by U.S. military in the Vietnam War, attested from 1971, said to have been used from 1961; so called from the color strip on the side of the container, which distinguished it from Agent Blue, Agent White, etc., other herbicides used by the U.S. military. Banned from April 1970.
orange (n.): c. 1300, of the fruit, from Old French orange, orenge (12c., Modern French orange), from Medieval Latin pomum de orenge, from Italian arancia, originally narancia (Venetian naranza), alteration of Arabic naranj, from Persian narang, from Sanskrit naranga-s "orange tree," of uncertain origin. Not used as a color word until 1540s.

Loss of initial n- probably due to confusion with definite article (as in une narange, una narancia), but perhaps influenced by French or "gold." The name of the town of Orange in France (see Orangemen) perhaps was deformed by the name of the fruit. Orange juice is attested from 1723.

The tree's original range probably was northern India. The Persian orange, grown widely in southern Europe after its introduction in Italy 11c., was bitter; sweet oranges were brought to Europe 15c. from India by Portuguese traders and quickly displaced the bitter variety, but only Modern Greek still seems to distinguish the bitter (nerantzi) from the sweet (portokali "Portuguese") orange. Portuguese, Spanish, Arab, and Dutch sailors planted citrus trees along trade routes to prevent scurvy. On his second voyage in 1493, Christopher Columbus brought the seeds of oranges, lemons and citrons to Haiti and the Caribbean. Introduced in Florida (along with lemons) in 1513 by Spanish explorer Juan Ponce de Leon. Introduced to Hawaii 1792.
orangeade (n.): from French, from orange + ending from lemonade.
Orangemen (n.): secret society founded 1795 in Belfast to promote Protestant power in Northern Ireland, named for William of Orange (who became King William III of England and triumphed in Ireland at the head of a Protestant army at the Battle of the Boyne), of the German House of Nassau. His cousins and their descendants constitute the royal line of Holland.

The name is from the town of Orange on the Rhone in France, which became part of the Nassau principality in 1530. Its Roman name was Arausio, which is said in 19c. sources to be from aura "a breeze" and a reference to the north winds which rush down the valley, but perhaps this is folk etymology of a Celtic word. The name subsequently was corrupted to Auranche, then Orange. The town has no obvious association with the fruit other than being on the road from Marseilles to Paris, along which masses of oranges were transported to northern France and beyond. In this roundabout way the political/religious movement of Northern Irish Protestantism acquired an association with the color orange, the Irish national flag acquired its orange band, and Syracuse University in New York state acquired its "Otto the Orange" mascot.
orangutan (n.): 1690s, from Dutch orang-outang (1631), from Malay orang utan, literally "man of the woods," from orang "man" + utan, hutan "forest, wild." It is possible that the word originally was used by town-dwellers on Java to describe savage forest tribes of the Sunda Islands and that Europeans misunderstood it to mean the ape. The name is not now applied in Malay to the animal, but there is evidence that it was used so in 17c. [OED]
sporangium (n.): "a case containing spores," 1821, Modern Latin (plural sporangia), from Greek spora "spore" (see spore) + angeion "vessel" (see angio-).