Isabella grape

~noun

Entry: a tall-growing grape that has heavily tomentose young growth and compact thyrses of bluish black to pink or greenish white fruits which are sharp and acid until fully ripe and that is an ancestor of most hardy American cultivated grapes.

Origin: Named after Isabella Gibbs, an American horticulturist who introduced it to the U.S. in 1816.

@ Milton-Kindersley Advanced Dictionary