Actinozoa

(noun) a large class of sedentary marine coelenterates that includes sea anemones and corals; the medusoid phase is entirely suppressed. Synonyms: Anthozoa, class Anthozoa, class Actinozoa.

(noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed. Synonyms: anthozoan, actinozoan.