Webster’s Revised Unabridged Dictionary · 1913
Hydrocorallia
Hy′dro·co·ral′li·a (·kō·răl′lĭ·ȧ), n. pl. [NL. See Hydra, and Coral.] (Zoöl.) 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.