akee

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. 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.
2. n. The edible, fleshy, ripe aril of this tree, especially popular as a food in Jamaica. The seeds and unripe arils are poisonous.

Century Dictionary and Cyclopedia

1. n. 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. It is a small tree, with ash like leaves and a fleshy fruit containing several large jet-black seeds partly embedded in a white spongy aril. This aril when cooked becomes somewhat like custard, and is highly esteemed.

Wiktionary

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

GNU Webster's 1913

1. n. 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.
2. n. red pear-shaped tropical fruit with poisonous seeds; the flesh is poisonous when unripe or overripe.

WordNet 3.0

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