custard apple

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of several tropical American trees of the genus Annona, especially A. reticulata, having large, nearly heart-shaped edible fruits with white to yellowish flesh.
2. n. The fruit of any of these trees.

Century Dictionary and Cyclopedia

1. n. The fruit of Anona reticulata, a native of the West Indies, but cultivated in all tropical countries. It is a large, dark-brown, roundish fruit, sometimes called bullock's-heart from its size and appearance.

Wiktionary

1. n. The soursop (fruit and tree)
2. n. The sugar apple, a related fruit.

GNU Webster's 1913

1. n. (Bot.) a low tree or shrub of tropical America, including several species of Anona (Anona squamosa, Anona reticulata, etc.), having a roundish or ovate fruit the size of a small orange, containing a soft, yellowish, edible pulp.

WordNet 3.0

1. n. any of several tropical American trees bearing fruit with soft edible pulp
2. n. the fruit of any of several tropical American trees of the genus Annona having soft edible pulp