n A tropical plant, Ananas comosus, native to South America, having thirty or more long, spined and pointed leaves surrounding a thick stem.
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.
n (uncountable) The flesh of a pineapple fruit used as a food item.
n (slang) An Australian fifty dollar note.
n A web burrfish (Chilomycterus antillarum, syn. Chilomycterus geometricus)
n A light yellow colour, like that of pineapple flesh (also called pineapple yellow).
n (obsolete) A pinecone.
n A decorative carving of a pineapple fruit used as a symbol of hospitality.
n (slang) A hand grenade. (From the similarity to the shape of a pineapple fruit.)
n A hairstyle consisting of a ponytail worn on top of the head, imitating the leaves of a pineapple.