[pi-stash-ee-oh, -stah-shee-oh]
noun, plural pistachios.
the nut of a Eurasian tree, Pistacia vera, of the cashew family, containing an edible, greenish kernel.
the kernel itself, used for flavoring.
the tree itself.
pistachio nut flavor.
Also, pistache [pi-stash] , pistachio nut (for defs 1, 2).

1375–1425; < Italian pistacchio < Latin pistācium < Greek pistákion pistachio nut, diminutive of pistákē pistachio tree < Middle Persian *pistak (Persian pista); replacing late Middle English pistace < Middle French < Latin, as above

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World English Dictionary
pistachio (pɪˈstɑːʃɪˌəʊ)
n , pl -os
1.  an anacardiaceous tree, Pistacia vera, of the Mediterranean region and W Asia, with small hard-shelled nuts
2.  Also called: pistachio nut the nut of this tree, having an edible green kernel
3.  the sweet flavour of the pistachio nut, used esp in ice creams
4.  of a yellowish-green colour
[C16: via Italian and Latin from Greek pistakion pistachio nut, from pistakē pistachio tree, from Persian pistah]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1598, from It. pistacchio, from L. pistacium "pistachio nut," from Gk. pistakion, from pistake "pistachio tree," from Pers. pista "pistachio tree." Borrowed earlier (1533) as pystace, from O.Fr. form pistace (13c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Their nature-inspired companions are mossy green and a near-pistachio shade of white.
It's a popular way to sample a range of dishes, such as tea-scented duck and lobster in a raisin-pistachio puree.
The free game's first two levels, set among pistachio trees, can be played
  without logging in.
Other varieties of cupcakes include almond, pistachio, chocolate peanut butter
  and carrot cake.
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