/ Dictionary / Index P pistachio: Meaning and Definition of Find definitions for: pis•tach•i•o Pronunciation: (pi-stash'ē-ō", -stä'shē-ō"), [key] — pl. -chi•os. 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. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pistachio (Thesaurus) pissy pistachio green Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language