1a large juicy tropical fruit consisting of aromatic edible yellow flesh surrounded by a tough segmented skin and topped with a tuft of stiff leaves:roughly chop the pineapples and apricots [mass noun]:slices of pineapple
2the widely cultivated tropical American plant that bears the pineapple. It is low-growing, with a spiral of spiny sword-shaped leaves on a thick stem.
Ananas comosus, family Bromeliaceae
3 informal a hand grenade.
the rough end of the pineapple
Australian informal a situation in which someone receives unfair or harsh treatment.
late Middle English (denoting a pine cone): from pine1+ apple. The word was applied to the fruit in the mid 17th century, because of its resemblance to a pine cone
pineapple in other Oxford dictionaries
Definition of pineapple in the US English dictionary