This pitted fruit of the Olea europaea tree lends its name to a shade of green
[DOC] [TLE] olive - definition of olive in English | Oxford Dictionaries [PAR] 1A small oval fruit with a hard stone and bitter flesh, green when unripe and 
bluish black when ripe, used .... 2.1Used in names of other trees which are 
related to the olive, resemble it, or bear similar fruit, e.g.