noun

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