akee

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

• noun A tropical western African evergreen tree (Blighia sapida) having leathery red-and-yellow fruits. It is naturalized and cultivated in the tropics and in Florida.
• noun The edible, fleshy, ripe aril of this tree, especially popular as a food in Jamaica. The seeds and unripe arils are poisonous.

from The Century Dictionary.

• noun The Cupania (Blighia) sapida, natural order Sapindaceæ, a native of Guinea, whence it was carried by Captain Bligh to Jamaica in 1793, and thence disseminated over the West Indies and South America.

from the GNU version of the Collaborative International Dictionary of English.

• noun a tree (Blighia sapida) widely cultivated in tropical and subtropical regions for its fragrant flowers and colorful fruits; introduced in Jamaica by Captain Bligh of the HMS Bounty.
• noun red pear-shaped tropical fruit with poisonous seeds; the flesh is poisonous when unripe or overripe.

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

• noun A tropical evergreen tree, Blighia sapida, related to the lychee and longan.
• noun The fruit of the ackee, of which only the arils are edible, the remainder being poisonous.

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

• noun red pear-shaped tropical fruit with poisonous seeds; flesh is poisonous when unripe or overripe
• noun widely cultivated in tropical and subtropical regions for its fragrant flowers and colorful fruits; introduced in Jamaica by William Bligh