The Collaborative International Dictionary of English v.0.48:

Semolina \Sem`o*li"na\, n. [It. semolino, from semola bran, L.
   simila the finest wheat flour. Cf. Semoule, Simnel.]
   The purified fine, hard parts of durum wheat, derived mostly
   from the endosperm, rounded by the attrition of the
   millstones, -- used in cookery, such as in the preparation of
   Italian pasta.
   [1913 Webster]

WordNet (r) 3.0 (2006):

semolina
    n 1: milled product of durum wheat (or other hard wheat) used in
         pasta