The Collaborative International Dictionary of English v.0.48:

blintz \blintz\, blintze \blintze\n.; pl. blintzes. [Yiddish
   blintze, fr. Byelorussian blinets, dimin. of Russ. blin. See
   also blin and blini.] (Jewish Cookery)
   a thin wheat pancake folded around a filling (such as cheese
   or fruit) and sauteed, fried, or baked.
   [WordNet 1.5 +PJC]