Source : Webster's Revised Unabridged Dictionary (1913)

{Molluscoidea}, including Brachiopoda and Bryozoa. {Mollusca},
including Cephalopoda, Gastropoda, Pteropoda, Scaphopoda,
Lamellibranchiata or Acephala. {Echinodermata}, including
Holothurioidea, Echinoidea, Asterioidea, Ophiuroidea, and
Crinoidea. {C[oe]lenterata}, including {Anthozoa} or {Polyps},
{Ctenophora}, and {Hydrozoa} or Acalephs. {Spongiozoa} or
{Porifera}, including the sponges.

Anthozoa \An`tho*zo"a\, n. pl. [NL., fr. Gr. 'a`nqos flower + ?
   animal.] (Zo["o]l.)
   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}.

Source : WordNet®

Anthozoa
     n : no alternation of generations the medusoid phase being
         entirely suppressed: sea anemones; corals [syn: {class
         Anthozoa}, {Actinozoa}, {class Actinozoa}]