Wiktionary
n. An olive picked before it has ripened; as opposed to a black olive which is picked after ripening.
WordNet
n. olives picked green and pickled in brine; infrequently stuffed with e.g. pimento
Usage examples of "green olive".
He could see the harvesters at work among the fields, orchards and silvery-green olive groves among them, and tracts of bright pasture where the city's famous horses were raised.
Here they were a minor element in the landscape's symphony, and small orchards of other fruit seemed as numerous: cherry and apricot, pear and plum, pomegranate and almond and walnut, gray-green olive and bushy fig.
To the right of the cross is a branch of green olive, showing the Church's mercy, and on the left is the sword of justice.
It looked like there were about six little buildings, surrounded by a patchwork of fields and gray-green olive groves on a little plateau above the blue Aegean.
Pushing back the brim of her orange cap, Nancy took in the view of silvery green olive trees stretching in rows along the hills next to the clustered white buildings of the village.