Real Dictionary

pineapple
variable noun: A pineapple is a large oval fruit that grows in hot countries. It is sweet, juicy, and yellow inside, and it has a thick brownish skin.

pineapple in American English
a juicy, edible tropical fruit somewhat resembling a pine cone: it consists of the fleshy inflorescence of a collective fruit developed from a spike of flowers
designating a large family (Bromeliaceae, order Bromeliales) of tropical and subtropical, mostly epiphytic, monocotyledonous plants, including the Spanish moss
noun: the edible, juicy, collective fruit of a tropical, bromeliaceous plant, Ananas comosus, that develops from a spike or head of flowers and is surmounted by a crown of leaves

pineapple in British English
noun: a tropical American bromeliaceous plant, Ananas comosus, cultivated in the tropics for its large fleshy edible fruit