what is knishes
Definition of KNISH. : a small round or square of dough stuffed with a filling (as potato) and baked or fried. See knish defined for kids.ADVERTISEMENT. Yiddish, from Polish knysz.efinition of KNISH. : a small round or square of dough stuffed with a filling (as potato) and baked or fried. See knish defined for kids. ADVERTISEMENT.