greengage

[green-geyj] /ˈgrinˌgeɪdʒ/
noun
1.
any of several varieties of light-green plums, as Prunus insititia italica.
Origin
1715-25; green + Gage, after Sir William Gage, 18th-century English botanist who introduced such varieties from France circa 1725
British Dictionary definitions for greengage

greengage

/ˈɡriːnˌɡeɪdʒ/
noun
1.
a cultivated variety of plum tree, Prunus domestica italica, with edible green plumlike fruits
2.
the fruit of this tree
Word Origin
C18: green + -gage, after Sir W. Gage (1777–1864), English botanist who brought it from France
Word Origin and History for greengage

from green + name of English botanist Sir William Gage (1657-1727) who first cultivated it in England c.1725.