Photo: Martin Burrow
Olive = a small oval fruit with a hard pit and bitter flesh, green when unripe and brownish black when ripe, used as food, and as a source of oil
University of California: The olive tree, Olea europaea, valued for both its beauty and its fruit, has been a part of Mediterranean civilization since before recorded history. The olive was cultivated and its oil traded as early as 3000 B.C.E. Olives and olive oil have been used for food, cooking, medicine, salve, soap, and lamp fuel.