ˈmiləˌpō(ə)r noun
Etymology: New Latin Millepora
: any of the stony hydrozoan reef-building corals comprising the order Milleporina with the single recent genus Millepora and like the madrepores with which they constitute the major reef-building corals assuming a variety of branching, encrusting, or massive forms though differing from the madrepores in passing through a free-swimming medusoid stage