Zoanthus \Zo*an"thus\, n. [NL. See {Zoantharia}.] (Zool.)
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.
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