Source : Webster's Revised Unabridged Dictionary (1913)

Mesozoa \Mes`o*zo"a\, n. pl. [NL. See {Mesozoic}.] (Zo["o]l.)
   A group of very lowly organized, wormlike parasites,
   including the Dicyemata. They are found in cephalopods. See
   {Dicyemata}.