Borrowed from Italian verdello, from the dark green color of its berries.
Verdello (countable and uncountable, plural Verdellos)
- An Italian grapevine variety that is grown mostly in the Umbria region of central Italy.
2014, Ian D'Agata, Native Wine Grapes of Italy, University of California Press, →ISBN, page 21:Thus when sampling Verdello grapevines, the likelihood of picking up a vine that really isn't Verdello is high, and the skill of the ampelographer becomes of paramount importance.