pistachio

[pi-stash-ee-oh, -stah-shee-oh]
noun, plural pis·tach·i·os.
  1. the nut of a Eurasian tree, Pistacia vera, of the cashew family, containing an edible, greenish kernel.
  2. the kernel itself, used for flavoring.
  3. the tree itself.
  4. pistachio nut flavor.
  5. pistachio green.
Also pis·tache [pi-stash] /pɪˈstæʃ/, pistachio nut (for defs 1, 2).

Origin of pistachio

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for pistachio

pistachio

noun plural -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
adjective
  1. of a yellowish-green colour

Word Origin for pistachio

C16: via Italian and Latin from Greek pistakion pistachio nut, from pistakē pistachio tree, from Persian pistah
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for pistachio
n.

1590s, from Italian pistacchio, from Latin pistacium "pistachio nut," from Greek pistakion "pistachio nut," from pistake "pistachio tree," from Persian pistah "pistachio." Borrowed earlier (1530s) as pystace, from Old French form pistace (13c.), which also is from the Italian word.

Online Etymology Dictionary, © 2010 Douglas Harper