The Collaborative International Dictionary of English v.0.48:

Anthozoa \An`tho*zo"a\, n. pl. [NL., fr. Gr. 'a`nqos flower + ?
   animal.] (Zool.)
   The class of the C[oe]lenterata which includes the corals and
   sea anemones. The three principal groups or orders are
   Acyonaria, Actinaria, and Madreporaria.
   [1913 Webster]