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.
the plant itself, having a short stem and rigid, spiny-margined, recurved leaves.
Military Slang. a fragmentation hand grenade.

1350–1400 for earlier sense; 1655–65 for def 1; Middle English pinappel pine cone; see pine1, apple Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pineapple (ˈpaɪnˌæpəl)
1.  a tropical American bromeliaceous plant, Ananas comosus, cultivated in the tropics for its large fleshy edible fruit
2.  the fruit of this plant, consisting of an inflorescence clustered around a fleshy axis and surmounted by a tuft of leaves
3.  slang military a hand grenade
[C14 pinappel pine cone; C17: applied to the fruit because of its appearance]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "pine cone," from pine (n.) + apple. The reference to the fruit of the tropical plant (from resemblance of shape) is first recorded 1660s, and pine cone emerged 1690s to replace pineapple in its original sense. For "pine cone," O.E. also used pinhnyte "pine nut."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We've grown sugarcane, pineapple, vegetables and fruits without using any
  pesticides and they have been healthy and delicious.
He had worked at an old pineapple cannery for many years and the acid had
  eventually worn away his fingerprints.
If too thick, add a little pineapple juice or extra rum, to taste.
For a taste of the tropics, top this burger with a combination of sweet and
  salty spam and pineapple.
Image for pineapple
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