Source : Webster's Revised Unabridged Dictionary (1913)

Malacozoa \Mal`a*co*zo"a\, n. pl. [NL., fr. Gr. ? soft + ? an
   animal.] (Zo["o]l.)
   An extensive group of Invertebrata, including the Mollusca,
   Brachiopoda, and Bryozoa. Called also {Malacozoaria}.