The Collaborative International Dictionary of English v.0.48:

Malacozoa \Mal`a*co*zo"a\, n. pl. [NL., fr. Gr. malako`s soft +
   zo^,on an animal.] (Zool.)
   An extensive group of Invertebrata, including the Mollusca,
   Brachiopoda, and Bryozoa. Called also Malacozoaria.
   [1913 Webster]