pineapple

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A tropical American plant (Ananas comosus) having large swordlike leaves and a large, fleshy, edible, multiple fruit with a terminal tuft of leaves.
2. n. The fruit of this plant.
3. n. Slang A hand grenade.

Century Dictionary and Cyclopedia

1. n. The cone or strobilus of the pine; a pine-cone.
2. n. The fruit of Ananas (Ananassa) sativa: so called from its resemblance to a pine-cone. This is a collective fruit, consisting of a matured spike or head of flowers, all parts of which — flowers, bracts, and axis — are consolidated in one succulent mass. In hothouse culture a single fruit has been known to weigh 14 pounds.
3. n. The plant Ananas sativa, a native of tropical South America, now widely cultivated and naturalized throughout the tropics. Its short stem rises from a cluster of rigid recurved leaves, like those of the aloe, but thinner. The axis extends beyond the single fruit in a tuft of short leaves called the crown. Highly cultivated varieties are seedless, and are propagated by the crown, or (commonly) by suckers, which produce fruit much sooner. The chief seat of pineapple cultivation is the West Indies, whence the fruit is exported in large quantities to the United States and England. The leaves, some 3 feet long, yield a strong fiber, which in the Philippine Islands and elsewhere is woven into a fine fabric. So-called pineapple-cloths are also made from the flber of other species of Bromeliaceæ, as Bromelia Pinguin, the wild pineapple.
4. n. A fish of the family Diodontidæ, a kind of porcupine-fish, Chilomycterus geometricus: so called from the prickly skin and the shape when inflated.

Wiktionary

1. n. A tropical plant, Ananas comosus, native to South America, having thirty or more long, spined and pointed leaves surrounding a thick stem.
2. n. The ovoid fruit of the pineapple plant, which has very sweet white or yellow flesh, a tough, spiky shell and a tough, fibrous core.
3. n. slang A hand grenade.
4. n. slang An Australian fifty dollar note.

GNU Webster's 1913

1. n. (Bot.) A tropical plant (Ananassa sativa); also, its fruit; -- so called from the resemblance of the latter, in shape and external appearance, to the cone of the pine tree. Its origin is unknown, though conjectured to be American.

WordNet 3.0

1. n. a tropical American plant bearing a large fleshy edible fruit with a terminal tuft of stiff leaves; widely cultivated in the tropics
2. n. large sweet fleshy tropical fruit with a terminal tuft of stiff leaves; widely cultivated