custard apple

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun 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.
• noun The fruit of any of these trees.

from The Century Dictionary.

• noun The fruit of Anona reticulata, a native of the West Indies, but cultivated in all tropical countries.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The soursop (fruit and tree)
• noun The sugar apple, a related fruit.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of several tropical American trees bearing fruit with soft edible pulp
• noun the fruit of any of several tropical American trees of the genus Annona having soft edible pulp