some of numerous reef-building hydrocorals of this order Milleporina of exotic marine waters, forming white or yellow calcareous frameworks and resembling the genuine corals for the course Anthozoa.
Any coral associated with genus Millepora, obtaining the surface almost smooth, and perforated with extremely small unequal pores, or cells.
Any coral of the genus Millepora, getting the surface almost smooth, and perforated with really minute unequal skin pores, or cells. The pets tend to be hydroids, maybe not Anthozoa. See hydrocorallia.