"Hydrocorallia" is a word in ENGLISH

hydrocorallia ENGLISH
Definition:

A division of Hydroidea, including those genera
that secrete a stony coral, as Millepora and Stylaster. Two forms of
zooids in life project from small pores in the coral and resemble those
of other hydroids. See Millepora.

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millepore ENGLISH

Any coral of the genus Millepora, having the surface nearly smooth, and perforated with very minute unequal pores, or cells. …

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sea ginger ENGLISH

A hydroid coral of the genus Millepora, especially M. alcicornis, of the West Indies and Florida. So called because it …

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