Madreporaria
plural noun
Mad·re·po·rar·ia
ˌmadrəpəˈra(a)rēə,
məˌdrep-
: an extensive order of Anthozoa including most species that produce stony corals and that resemble the actiniarians in the general structure of the soft parts but that usually form colonies and always have an ectodermal calcareous skeleton
madreporarian
adjective or noun
¦madrəpə¦ra(a)rēən
mə¦drep-
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Merriam-Webster unabridged
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