madrepore

/mad-ruh-pawr, -pohr/US // ˈmæd rəˌpɔr, -ˌpoʊr //UK // (ˌmædrɪˈpɔː) //

疯人院,疯了,疯牛病

Definitions

n.名词 noun

1
- : any true or stony coral of the order Madreporaria, forming reefs or islands in tropical seas.

I could observe groups and clusters of coloured coral and madrepore-stone, whose magnificence challenges all description.
The madrepore corals are called reef-builders, but not in the sense of constructors of reefs.
Third picture: in shallow seas have sprung up isles of madrepore; a cluster of palm trees overhangs them here and there.
Many of these limestones owe their beauty to the fossil corals which they contain, and are hence known as “madrepore marbles.”
Those here are of reddish variegated, hardened sandstone, with madrepore holes in it.