Source : Webster's Revised Unabridged Dictionary (1913)

Zoanthacea \Zo`an*tha"ce*a\, n. pl. [NL., from Gr. zw^,on an
   animal + ? flower.] (Zo["o]l.)
   A suborder of Actinaria, including {Zoanthus} and allied
   genera, which are permanently attached by their bases.

Zoanthus \Zo*an"thus\, n. [NL. See {Zoantharia}.] (Zo["o]l.)
   A genus of Actinaria, including numerous species, found
   mostly in tropical seas. The zooids or polyps resemble small,
   elongated actinias united together at their bases by fleshy
   stolons, and thus forming extensive groups. The tentacles are
   small and bright colored.