Source : Webster's Revised Unabridged Dictionary (1913)

Vermicelli \Ver`mi*cel"li\, n. [It., pl. of vermicello,
   literally, a little worm, dim. of verme a worm, L. vermis.
   See {Worm}, and cf. {Vermicule}, {Vermeil}.]
   The flour of a hard and small-grained wheat made into dough,
   and forced through small cylinders or pipes till it takes a
   slender, wormlike form, whence the Italian name. When the
   paste is made in larger tubes, it is called macaroni.

Source : WordNet®

vermicelli
     n : pasta in strings thinner than spaghetti