sorb apple

Wiktionary

1. n. A European fruit tree, Sorbus domestica, also called the service tree
2. n. The fruit of this tree, also called the sorb

GNU Webster's 1913

1. n. the fruit of the sorb, or wild service tree.

WordNet 3.0

1. n. acid gritty-textured fruit
2. n. medium-sized European tree resembling the rowan but bearing edible fruit