/ pɪˈstæʃiəʊ; -ˈstɑːʃiəʊ; NAmE -ʃioʊ/ noun ( pl. -os )
1.
(also piˈstachio nut ) [ C ] the small green nut of an Asian tree
2.
[ U ] a pale green colour
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WORD ORIGIN
late Middle English pistace , from Old French , superseded in the 16th cent. by forms from Italian pistaccio , via Latin from Greek pistakion , from Old Persian .