The Collaborative International Dictionary of English v.0.48:

blin \blin\, n.; pl. blini, bliny or blinis. [Russian.]
   a thin buckwheat pancake made with yeast and usually filled
   with sour cream and folded over. See also blini.
   [PJC]

The Collaborative International Dictionary of English v.0.48:

blini \bli"ni\ (bl[=e]"n[=e]; bl[i^]"n[=e]), n. pl.; sing.
   blin. [Russian.]
   Russian pancakes of buckwheat flour and yeast, sometimes made
   from white flour; they are usually served folded over, with
   caviar and sour cream on the inside; -- properly, it is a
   plural word (from the Russian plural of blin) but in America,
   often used as singular; thus the common plural blinis.

   Syn: bliny, blinis.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

blini
    n 1: Russian pancake of buckwheat flour and yeast; usually
         served with caviar and sour cream [syn: blini, bliny]